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lavc: split slice and frame threading functions into separate files

tags/n2.2-rc1
Anton Khirnov 11 years ago
parent
5cd6513f5b
commit
cc14ee03a7
5 changed files with 1057 additions and 949 deletions
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  1. +2
    -2
      libavcodec/Makefile
  2. +5
    -947
      libavcodec/pthread.c
  3. +792
    -0
      libavcodec/pthread_frame.c
  4. +34
    -0
      libavcodec/pthread_internal.h
  5. +224
    -0
      libavcodec/pthread_slice.c

+ 2
- 2
libavcodec/Makefile View File

@@ -677,8 +677,8 @@ OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o
OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o

# thread libraries
OBJS-$(HAVE_PTHREADS) += pthread.o
OBJS-$(HAVE_W32THREADS) += pthread.o
OBJS-$(HAVE_PTHREADS) += pthread.o pthread_slice.o pthread_frame.o
OBJS-$(HAVE_W32THREADS) += pthread.o pthread_slice.o pthread_frame.o

SKIPHEADERS += %_tablegen.h \
%_tables.h \


+ 5
- 947
libavcodec/pthread.c View File

@@ -29,948 +29,10 @@
* @see doc/multithreading.txt
*/

#include "config.h"

#include "avcodec.h"
#include "internal.h"
#include "pthread_internal.h"
#include "thread.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/internal.h"

#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "compat/w32pthreads.h"
#endif

typedef int (action_func)(AVCodecContext *c, void *arg);
typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);

typedef struct ThreadContext {
pthread_t *workers;
action_func *func;
action_func2 *func2;
void *args;
int *rets;
int rets_count;
int job_count;
int job_size;

pthread_cond_t last_job_cond;
pthread_cond_t current_job_cond;
pthread_mutex_t current_job_lock;
unsigned current_execute;
int current_job;
int done;
} ThreadContext;

/**
* Context used by codec threads and stored in their AVCodecContext thread_opaque.
*/
typedef struct PerThreadContext {
struct FrameThreadContext *parent;

pthread_t thread;
int thread_init;
pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.

pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.

AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.

AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
uint8_t *buf; ///< backup storage for packet data when the input packet is not refcounted
int allocated_buf_size; ///< Size allocated for buf

AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
int result; ///< The result of the last codec decode/encode() call.

enum {
STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
STATE_GET_BUFFER, /**<
* Set when the codec calls get_buffer().
* State is returned to STATE_SETTING_UP afterwards.
*/
STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
} state;

/**
* Array of frames passed to ff_thread_release_buffer().
* Frames are released after all threads referencing them are finished.
*/
AVFrame *released_buffers;
int num_released_buffers;
int released_buffers_allocated;

AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
int requested_flags; ///< flags passed to get_buffer() for requested_frame
} PerThreadContext;

/**
* Context stored in the client AVCodecContext thread_opaque.
*/
typedef struct FrameThreadContext {
PerThreadContext *threads; ///< The contexts for each thread.
PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.

pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().

int next_decoding; ///< The next context to submit a packet to.
int next_finished; ///< The next context to return output from.

int delaying; /**<
* Set for the first N packets, where N is the number of threads.
* While it is set, ff_thread_en/decode_frame won't return any results.
*/

int die; ///< Set when threads should exit.
} FrameThreadContext;


/* H264 slice threading seems to be buggy with more than 16 threads,
* limit the number of threads to 16 for automatic detection */
#define MAX_AUTO_THREADS 16

static void* attribute_align_arg worker(void *v)
{
AVCodecContext *avctx = v;
ThreadContext *c = avctx->thread_opaque;
unsigned last_execute = 0;
int our_job = c->job_count;
int thread_count = avctx->thread_count;
int self_id;

pthread_mutex_lock(&c->current_job_lock);
self_id = c->current_job++;
for (;;){
while (our_job >= c->job_count) {
if (c->current_job == thread_count + c->job_count)
pthread_cond_signal(&c->last_job_cond);

while (last_execute == c->current_execute && !c->done)
pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
last_execute = c->current_execute;
our_job = self_id;

if (c->done) {
pthread_mutex_unlock(&c->current_job_lock);
return NULL;
}
}
pthread_mutex_unlock(&c->current_job_lock);

c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
c->func2(avctx, c->args, our_job, self_id);

pthread_mutex_lock(&c->current_job_lock);
our_job = c->current_job++;
}
}

static av_always_inline void thread_park_workers(ThreadContext *c, int thread_count)
{
while (c->current_job != thread_count + c->job_count)
pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
pthread_mutex_unlock(&c->current_job_lock);
}

static void thread_free(AVCodecContext *avctx)
{
ThreadContext *c = avctx->thread_opaque;
int i;

pthread_mutex_lock(&c->current_job_lock);
c->done = 1;
pthread_cond_broadcast(&c->current_job_cond);
pthread_mutex_unlock(&c->current_job_lock);

for (i=0; i<avctx->thread_count; i++)
pthread_join(c->workers[i], NULL);

pthread_mutex_destroy(&c->current_job_lock);
pthread_cond_destroy(&c->current_job_cond);
pthread_cond_destroy(&c->last_job_cond);
av_free(c->workers);
av_freep(&avctx->thread_opaque);
}

static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
{
ThreadContext *c= avctx->thread_opaque;
int dummy_ret;

if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);

if (job_count <= 0)
return 0;

pthread_mutex_lock(&c->current_job_lock);

c->current_job = avctx->thread_count;
c->job_count = job_count;
c->job_size = job_size;
c->args = arg;
c->func = func;
if (ret) {
c->rets = ret;
c->rets_count = job_count;
} else {
c->rets = &dummy_ret;
c->rets_count = 1;
}
c->current_execute++;
pthread_cond_broadcast(&c->current_job_cond);

thread_park_workers(c, avctx->thread_count);

return 0;
}

static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
{
ThreadContext *c= avctx->thread_opaque;
c->func2 = func2;
return thread_execute(avctx, NULL, arg, ret, job_count, 0);
}

static int thread_init_internal(AVCodecContext *avctx)
{
int i;
ThreadContext *c;
int thread_count = avctx->thread_count;

if (!thread_count) {
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
else
thread_count = avctx->thread_count = 1;
}

if (thread_count <= 1) {
avctx->active_thread_type = 0;
return 0;
}

c = av_mallocz(sizeof(ThreadContext));
if (!c)
return -1;

c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
if (!c->workers) {
av_free(c);
return -1;
}

avctx->thread_opaque = c;
c->current_job = 0;
c->job_count = 0;
c->job_size = 0;
c->done = 0;
pthread_cond_init(&c->current_job_cond, NULL);
pthread_cond_init(&c->last_job_cond, NULL);
pthread_mutex_init(&c->current_job_lock, NULL);
pthread_mutex_lock(&c->current_job_lock);
for (i=0; i<thread_count; i++) {
if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
avctx->thread_count = i;
pthread_mutex_unlock(&c->current_job_lock);
ff_thread_free(avctx);
return -1;
}
}

thread_park_workers(c, thread_count);

avctx->execute = thread_execute;
avctx->execute2 = thread_execute2;
return 0;
}

/**
* Codec worker thread.
*
* Automatically calls ff_thread_finish_setup() if the codec does
* not provide an update_thread_context method, or if the codec returns
* before calling it.
*/
static attribute_align_arg void *frame_worker_thread(void *arg)
{
PerThreadContext *p = arg;
FrameThreadContext *fctx = p->parent;
AVCodecContext *avctx = p->avctx;
const AVCodec *codec = avctx->codec;

while (1) {
if (p->state == STATE_INPUT_READY && !fctx->die) {
pthread_mutex_lock(&p->mutex);
while (p->state == STATE_INPUT_READY && !fctx->die)
pthread_cond_wait(&p->input_cond, &p->mutex);
pthread_mutex_unlock(&p->mutex);
}

if (fctx->die) break;

if (!codec->update_thread_context && avctx->thread_safe_callbacks)
ff_thread_finish_setup(avctx);

pthread_mutex_lock(&p->mutex);
avcodec_get_frame_defaults(&p->frame);
p->got_frame = 0;
p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);

/* many decoders assign whole AVFrames, thus overwriting extended_data;
* make sure it's set correctly */
p->frame.extended_data = p->frame.data;

if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);

p->state = STATE_INPUT_READY;

pthread_mutex_lock(&p->progress_mutex);
pthread_cond_signal(&p->output_cond);
pthread_mutex_unlock(&p->progress_mutex);

pthread_mutex_unlock(&p->mutex);
}

return NULL;
}

/**
* Update the next thread's AVCodecContext with values from the reference thread's context.
*
* @param dst The destination context.
* @param src The source context.
* @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
*/
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
{
int err = 0;

if (dst != src) {
dst->time_base = src->time_base;
dst->width = src->width;
dst->height = src->height;
dst->pix_fmt = src->pix_fmt;

dst->coded_width = src->coded_width;
dst->coded_height = src->coded_height;

dst->has_b_frames = src->has_b_frames;
dst->idct_algo = src->idct_algo;

dst->bits_per_coded_sample = src->bits_per_coded_sample;
dst->sample_aspect_ratio = src->sample_aspect_ratio;
dst->dtg_active_format = src->dtg_active_format;

dst->profile = src->profile;
dst->level = src->level;

dst->bits_per_raw_sample = src->bits_per_raw_sample;
dst->ticks_per_frame = src->ticks_per_frame;
dst->color_primaries = src->color_primaries;

dst->color_trc = src->color_trc;
dst->colorspace = src->colorspace;
dst->color_range = src->color_range;
dst->chroma_sample_location = src->chroma_sample_location;

dst->hwaccel = src->hwaccel;
dst->hwaccel_context = src->hwaccel_context;
}

if (for_user) {
dst->coded_frame = src->coded_frame;
} else {
if (dst->codec->update_thread_context)
err = dst->codec->update_thread_context(dst, src);
}

return err;
}

/**
* Update the next thread's AVCodecContext with values set by the user.
*
* @param dst The destination context.
* @param src The source context.
* @return 0 on success, negative error code on failure
*/
static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
{
#define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
dst->flags = src->flags;

dst->draw_horiz_band= src->draw_horiz_band;
dst->get_buffer2 = src->get_buffer2;
#if FF_API_GET_BUFFER
FF_DISABLE_DEPRECATION_WARNINGS
dst->get_buffer = src->get_buffer;
dst->release_buffer = src->release_buffer;
FF_ENABLE_DEPRECATION_WARNINGS
#endif

dst->opaque = src->opaque;
dst->debug = src->debug;

dst->slice_flags = src->slice_flags;
dst->flags2 = src->flags2;

copy_fields(skip_loop_filter, subtitle_header);

dst->frame_number = src->frame_number;
dst->reordered_opaque = src->reordered_opaque;

if (src->slice_count && src->slice_offset) {
if (dst->slice_count < src->slice_count) {
int *tmp = av_realloc(dst->slice_offset, src->slice_count *
sizeof(*dst->slice_offset));
if (!tmp) {
av_free(dst->slice_offset);
return AVERROR(ENOMEM);
}
dst->slice_offset = tmp;
}
memcpy(dst->slice_offset, src->slice_offset,
src->slice_count * sizeof(*dst->slice_offset));
}
dst->slice_count = src->slice_count;
return 0;
#undef copy_fields
}

/// Releases the buffers that this decoding thread was the last user of.
static void release_delayed_buffers(PerThreadContext *p)
{
FrameThreadContext *fctx = p->parent;

while (p->num_released_buffers > 0) {
AVFrame *f;

pthread_mutex_lock(&fctx->buffer_mutex);

// fix extended data in case the caller screwed it up
av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO);
f = &p->released_buffers[--p->num_released_buffers];
f->extended_data = f->data;
av_frame_unref(f);

pthread_mutex_unlock(&fctx->buffer_mutex);
}
}

static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
{
FrameThreadContext *fctx = p->parent;
PerThreadContext *prev_thread = fctx->prev_thread;
const AVCodec *codec = p->avctx->codec;

if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;

pthread_mutex_lock(&p->mutex);

release_delayed_buffers(p);

if (prev_thread) {
int err;
if (prev_thread->state == STATE_SETTING_UP) {
pthread_mutex_lock(&prev_thread->progress_mutex);
while (prev_thread->state == STATE_SETTING_UP)
pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
pthread_mutex_unlock(&prev_thread->progress_mutex);
}

err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
if (err) {
pthread_mutex_unlock(&p->mutex);
return err;
}
}

av_buffer_unref(&p->avpkt.buf);
p->avpkt = *avpkt;
if (avpkt->buf)
p->avpkt.buf = av_buffer_ref(avpkt->buf);
else {
av_fast_malloc(&p->buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
p->avpkt.data = p->buf;
memcpy(p->buf, avpkt->data, avpkt->size);
memset(p->buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}

p->state = STATE_SETTING_UP;
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);

/*
* If the client doesn't have a thread-safe get_buffer(),
* then decoding threads call back to the main thread,
* and it calls back to the client here.
*/

FF_DISABLE_DEPRECATION_WARNINGS
if (!p->avctx->thread_safe_callbacks && (
#if FF_API_GET_BUFFER
p->avctx->get_buffer ||
#endif
p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
FF_ENABLE_DEPRECATION_WARNINGS
while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state == STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

if (p->state == STATE_GET_BUFFER) {
p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
p->state = STATE_SETTING_UP;
pthread_cond_signal(&p->progress_cond);
}
pthread_mutex_unlock(&p->progress_mutex);
}
}

fctx->prev_thread = p;
fctx->next_decoding++;

return 0;
}

int ff_thread_decode_frame(AVCodecContext *avctx,
AVFrame *picture, int *got_picture_ptr,
AVPacket *avpkt)
{
FrameThreadContext *fctx = avctx->thread_opaque;
int finished = fctx->next_finished;
PerThreadContext *p;
int err;

/*
* Submit a packet to the next decoding thread.
*/

p = &fctx->threads[fctx->next_decoding];
err = update_context_from_user(p->avctx, avctx);
if (err) return err;
err = submit_packet(p, avpkt);
if (err) return err;

/*
* If we're still receiving the initial packets, don't return a frame.
*/

if (fctx->delaying) {
if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;

*got_picture_ptr=0;
if (avpkt->size)
return avpkt->size;
}

/*
* Return the next available frame from the oldest thread.
* If we're at the end of the stream, then we have to skip threads that
* didn't output a frame, because we don't want to accidentally signal
* EOF (avpkt->size == 0 && *got_picture_ptr == 0).
*/

do {
p = &fctx->threads[finished++];

if (p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}

av_frame_move_ref(picture, &p->frame);
*got_picture_ptr = p->got_frame;
picture->pkt_dts = p->avpkt.dts;

/*
* A later call with avkpt->size == 0 may loop over all threads,
* including this one, searching for a frame to return before being
* stopped by the "finished != fctx->next_finished" condition.
* Make sure we don't mistakenly return the same frame again.
*/
p->got_frame = 0;

if (finished >= avctx->thread_count) finished = 0;
} while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);

update_context_from_thread(avctx, p->avctx, 1);

if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;

fctx->next_finished = finished;

/* return the size of the consumed packet if no error occurred */
return (p->result >= 0) ? avpkt->size : p->result;
}

void ff_thread_report_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->progress ? (int*)f->progress->data : NULL;

if (!progress || progress[field] >= n) return;

p = f->owner->thread_opaque;

if (f->owner->debug&FF_DEBUG_THREADS)
av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);

pthread_mutex_lock(&p->progress_mutex);
progress[field] = n;
pthread_cond_broadcast(&p->progress_cond);
pthread_mutex_unlock(&p->progress_mutex);
}

void ff_thread_await_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->progress ? (int*)f->progress->data : NULL;

if (!progress || progress[field] >= n) return;

p = f->owner->thread_opaque;

if (f->owner->debug&FF_DEBUG_THREADS)
av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);

pthread_mutex_lock(&p->progress_mutex);
while (progress[field] < n)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}

void ff_thread_finish_setup(AVCodecContext *avctx) {
PerThreadContext *p = avctx->thread_opaque;

if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;

pthread_mutex_lock(&p->progress_mutex);
p->state = STATE_SETUP_FINISHED;
pthread_cond_broadcast(&p->progress_cond);
pthread_mutex_unlock(&p->progress_mutex);
}

/// Waits for all threads to finish.
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
{
int i;

for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];

if (p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}
}
}

static void frame_thread_free(AVCodecContext *avctx, int thread_count)
{
FrameThreadContext *fctx = avctx->thread_opaque;
const AVCodec *codec = avctx->codec;
int i;

park_frame_worker_threads(fctx, thread_count);

if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);

fctx->die = 1;

for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];

pthread_mutex_lock(&p->mutex);
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);

if (p->thread_init)
pthread_join(p->thread, NULL);

if (codec->close)
codec->close(p->avctx);

avctx->codec = NULL;

release_delayed_buffers(p);
av_frame_unref(&p->frame);
}

for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];

pthread_mutex_destroy(&p->mutex);
pthread_mutex_destroy(&p->progress_mutex);
pthread_cond_destroy(&p->input_cond);
pthread_cond_destroy(&p->progress_cond);
pthread_cond_destroy(&p->output_cond);
av_buffer_unref(&p->avpkt.buf);
av_freep(&p->buf);
av_freep(&p->released_buffers);

if (i) {
av_freep(&p->avctx->priv_data);
av_freep(&p->avctx->internal);
av_freep(&p->avctx->slice_offset);
}

av_freep(&p->avctx);
}

av_freep(&fctx->threads);
pthread_mutex_destroy(&fctx->buffer_mutex);
av_freep(&avctx->thread_opaque);
}

static int frame_thread_init(AVCodecContext *avctx)
{
int thread_count = avctx->thread_count;
const AVCodec *codec = avctx->codec;
AVCodecContext *src = avctx;
FrameThreadContext *fctx;
int i, err = 0;

if (!thread_count) {
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
else
thread_count = avctx->thread_count = 1;
}

if (thread_count <= 1) {
avctx->active_thread_type = 0;
return 0;
}

avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));

fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
pthread_mutex_init(&fctx->buffer_mutex, NULL);
fctx->delaying = 1;

for (i = 0; i < thread_count; i++) {
AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
PerThreadContext *p = &fctx->threads[i];

pthread_mutex_init(&p->mutex, NULL);
pthread_mutex_init(&p->progress_mutex, NULL);
pthread_cond_init(&p->input_cond, NULL);
pthread_cond_init(&p->progress_cond, NULL);
pthread_cond_init(&p->output_cond, NULL);

p->parent = fctx;
p->avctx = copy;

if (!copy) {
err = AVERROR(ENOMEM);
goto error;
}

*copy = *src;
copy->thread_opaque = p;
copy->pkt = &p->avpkt;

if (!i) {
src = copy;

if (codec->init)
err = codec->init(copy);

update_context_from_thread(avctx, copy, 1);
} else {
copy->priv_data = av_malloc(codec->priv_data_size);
if (!copy->priv_data) {
err = AVERROR(ENOMEM);
goto error;
}
memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
copy->internal = av_malloc(sizeof(AVCodecInternal));
if (!copy->internal) {
err = AVERROR(ENOMEM);
goto error;
}
*copy->internal = *src->internal;
copy->internal->is_copy = 1;

if (codec->init_thread_copy)
err = codec->init_thread_copy(copy);
}

if (err) goto error;

if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
p->thread_init = 1;
}

return 0;

error:
frame_thread_free(avctx, i+1);

return err;
}

void ff_thread_flush(AVCodecContext *avctx)
{
int i;
FrameThreadContext *fctx = avctx->thread_opaque;

if (!avctx->thread_opaque) return;

park_frame_worker_threads(fctx, avctx->thread_count);
if (fctx->prev_thread) {
if (fctx->prev_thread != &fctx->threads[0])
update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
if (avctx->codec->flush)
avctx->codec->flush(fctx->threads[0].avctx);
}

fctx->next_decoding = fctx->next_finished = 0;
fctx->delaying = 1;
fctx->prev_thread = NULL;
for (i = 0; i < avctx->thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
// Make sure decode flush calls with size=0 won't return old frames
p->got_frame = 0;
av_frame_unref(&p->frame);

release_delayed_buffers(p);
}
}

int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
PerThreadContext *p = avctx->thread_opaque;
int err;

f->owner = avctx;

if (!(avctx->active_thread_type & FF_THREAD_FRAME))
return ff_get_buffer(avctx, f->f, flags);

if (p->state != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
return -1;
}

if (avctx->internal->allocate_progress) {
int *progress;
f->progress = av_buffer_alloc(2 * sizeof(int));
if (!f->progress) {
return AVERROR(ENOMEM);
}
progress = (int*)f->progress->data;

progress[0] = progress[1] = -1;
}

pthread_mutex_lock(&p->parent->buffer_mutex);
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->thread_safe_callbacks || (
#if FF_API_GET_BUFFER
!avctx->get_buffer &&
#endif
avctx->get_buffer2 == avcodec_default_get_buffer2)) {
FF_ENABLE_DEPRECATION_WARNINGS
err = ff_get_buffer(avctx, f->f, flags);
} else {
p->requested_frame = f->f;
p->requested_flags = flags;
p->state = STATE_GET_BUFFER;
pthread_mutex_lock(&p->progress_mutex);
pthread_cond_signal(&p->progress_cond);

while (p->state != STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

err = p->result;

pthread_mutex_unlock(&p->progress_mutex);

}
if (!avctx->thread_safe_callbacks && !avctx->codec->update_thread_context)
ff_thread_finish_setup(avctx);

if (err)
av_buffer_unref(&f->progress);

pthread_mutex_unlock(&p->parent->buffer_mutex);

return err;
}

void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
{
PerThreadContext *p = avctx->thread_opaque;
FrameThreadContext *fctx;
AVFrame *dst, *tmp;
FF_DISABLE_DEPRECATION_WARNINGS
int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
avctx->thread_safe_callbacks ||
(
#if FF_API_GET_BUFFER
!avctx->get_buffer &&
#endif
avctx->get_buffer2 == avcodec_default_get_buffer2);
FF_ENABLE_DEPRECATION_WARNINGS

if (!f->f->data[0])
return;

if (avctx->debug & FF_DEBUG_BUFFERS)
av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);

av_buffer_unref(&f->progress);
f->owner = NULL;

if (can_direct_free) {
av_frame_unref(f->f);
return;
}

fctx = p->parent;
pthread_mutex_lock(&fctx->buffer_mutex);

if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
goto fail;
tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
(p->num_released_buffers + 1) *
sizeof(*p->released_buffers));
if (!tmp)
goto fail;
p->released_buffers = tmp;

dst = &p->released_buffers[p->num_released_buffers];
av_frame_move_ref(dst, f->f);

p->num_released_buffers++;

fail:
pthread_mutex_unlock(&fctx->buffer_mutex);
}

/**
* Set the threading algorithms used.
@@ -1007,16 +69,12 @@ static void validate_thread_parameters(AVCodecContext *avctx)

int ff_thread_init(AVCodecContext *avctx)
{
#if HAVE_W32THREADS
w32thread_init();
#endif

validate_thread_parameters(avctx);

if (avctx->active_thread_type&FF_THREAD_SLICE)
return thread_init_internal(avctx);
return ff_slice_thread_init(avctx);
else if (avctx->active_thread_type&FF_THREAD_FRAME)
return frame_thread_init(avctx);
return ff_frame_thread_init(avctx);

return 0;
}
@@ -1024,7 +82,7 @@ int ff_thread_init(AVCodecContext *avctx)
void ff_thread_free(AVCodecContext *avctx)
{
if (avctx->active_thread_type&FF_THREAD_FRAME)
frame_thread_free(avctx, avctx->thread_count);
ff_frame_thread_free(avctx, avctx->thread_count);
else
thread_free(avctx);
ff_slice_thread_free(avctx);
}

+ 792
- 0
libavcodec/pthread_frame.c View File

@@ -0,0 +1,792 @@
/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/**
* @file
* Frame multithreading support functions
* @see doc/multithreading.txt
*/

#include "config.h"

#include <stdint.h>

#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "compat/w32pthreads.h"
#endif

#include "avcodec.h"
#include "internal.h"
#include "pthread_internal.h"
#include "thread.h"

#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/frame.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"

/**
* Context used by codec threads and stored in their AVCodecContext thread_opaque.
*/
typedef struct PerThreadContext {
struct FrameThreadContext *parent;

pthread_t thread;
int thread_init;
pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.

pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.

AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.

AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
uint8_t *buf; ///< backup storage for packet data when the input packet is not refcounted
int allocated_buf_size; ///< Size allocated for buf

AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
int result; ///< The result of the last codec decode/encode() call.

enum {
STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
STATE_GET_BUFFER, /**<
* Set when the codec calls get_buffer().
* State is returned to STATE_SETTING_UP afterwards.
*/
STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
} state;

/**
* Array of frames passed to ff_thread_release_buffer().
* Frames are released after all threads referencing them are finished.
*/
AVFrame *released_buffers;
int num_released_buffers;
int released_buffers_allocated;

AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
int requested_flags; ///< flags passed to get_buffer() for requested_frame
} PerThreadContext;

/**
* Context stored in the client AVCodecContext thread_opaque.
*/
typedef struct FrameThreadContext {
PerThreadContext *threads; ///< The contexts for each thread.
PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.

pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().

int next_decoding; ///< The next context to submit a packet to.
int next_finished; ///< The next context to return output from.

int delaying; /**<
* Set for the first N packets, where N is the number of threads.
* While it is set, ff_thread_en/decode_frame won't return any results.
*/

int die; ///< Set when threads should exit.
} FrameThreadContext;

/**
* Codec worker thread.
*
* Automatically calls ff_thread_finish_setup() if the codec does
* not provide an update_thread_context method, or if the codec returns
* before calling it.
*/
static attribute_align_arg void *frame_worker_thread(void *arg)
{
PerThreadContext *p = arg;
FrameThreadContext *fctx = p->parent;
AVCodecContext *avctx = p->avctx;
const AVCodec *codec = avctx->codec;

while (1) {
if (p->state == STATE_INPUT_READY && !fctx->die) {
pthread_mutex_lock(&p->mutex);
while (p->state == STATE_INPUT_READY && !fctx->die)
pthread_cond_wait(&p->input_cond, &p->mutex);
pthread_mutex_unlock(&p->mutex);
}

if (fctx->die) break;

if (!codec->update_thread_context && avctx->thread_safe_callbacks)
ff_thread_finish_setup(avctx);

pthread_mutex_lock(&p->mutex);
avcodec_get_frame_defaults(&p->frame);
p->got_frame = 0;
p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);

/* many decoders assign whole AVFrames, thus overwriting extended_data;
* make sure it's set correctly */
p->frame.extended_data = p->frame.data;

if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);

p->state = STATE_INPUT_READY;

pthread_mutex_lock(&p->progress_mutex);
pthread_cond_signal(&p->output_cond);
pthread_mutex_unlock(&p->progress_mutex);

pthread_mutex_unlock(&p->mutex);
}

return NULL;
}

/**
* Update the next thread's AVCodecContext with values from the reference thread's context.
*
* @param dst The destination context.
* @param src The source context.
* @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
*/
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
{
int err = 0;

if (dst != src) {
dst->time_base = src->time_base;
dst->width = src->width;
dst->height = src->height;
dst->pix_fmt = src->pix_fmt;

dst->coded_width = src->coded_width;
dst->coded_height = src->coded_height;

dst->has_b_frames = src->has_b_frames;
dst->idct_algo = src->idct_algo;

dst->bits_per_coded_sample = src->bits_per_coded_sample;
dst->sample_aspect_ratio = src->sample_aspect_ratio;
dst->dtg_active_format = src->dtg_active_format;

dst->profile = src->profile;
dst->level = src->level;

dst->bits_per_raw_sample = src->bits_per_raw_sample;
dst->ticks_per_frame = src->ticks_per_frame;
dst->color_primaries = src->color_primaries;

dst->color_trc = src->color_trc;
dst->colorspace = src->colorspace;
dst->color_range = src->color_range;
dst->chroma_sample_location = src->chroma_sample_location;

dst->hwaccel = src->hwaccel;
dst->hwaccel_context = src->hwaccel_context;
}

if (for_user) {
dst->coded_frame = src->coded_frame;
} else {
if (dst->codec->update_thread_context)
err = dst->codec->update_thread_context(dst, src);
}

return err;
}

/**
* Update the next thread's AVCodecContext with values set by the user.
*
* @param dst The destination context.
* @param src The source context.
* @return 0 on success, negative error code on failure
*/
static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
{
#define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
dst->flags = src->flags;

dst->draw_horiz_band= src->draw_horiz_band;
dst->get_buffer2 = src->get_buffer2;
#if FF_API_GET_BUFFER
FF_DISABLE_DEPRECATION_WARNINGS
dst->get_buffer = src->get_buffer;
dst->release_buffer = src->release_buffer;
FF_ENABLE_DEPRECATION_WARNINGS
#endif

dst->opaque = src->opaque;
dst->debug = src->debug;

dst->slice_flags = src->slice_flags;
dst->flags2 = src->flags2;

copy_fields(skip_loop_filter, subtitle_header);

dst->frame_number = src->frame_number;
dst->reordered_opaque = src->reordered_opaque;

if (src->slice_count && src->slice_offset) {
if (dst->slice_count < src->slice_count) {
int *tmp = av_realloc(dst->slice_offset, src->slice_count *
sizeof(*dst->slice_offset));
if (!tmp) {
av_free(dst->slice_offset);
return AVERROR(ENOMEM);
}
dst->slice_offset = tmp;
}
memcpy(dst->slice_offset, src->slice_offset,
src->slice_count * sizeof(*dst->slice_offset));
}
dst->slice_count = src->slice_count;
return 0;
#undef copy_fields
}

/// Releases the buffers that this decoding thread was the last user of.
static void release_delayed_buffers(PerThreadContext *p)
{
FrameThreadContext *fctx = p->parent;

while (p->num_released_buffers > 0) {
AVFrame *f;

pthread_mutex_lock(&fctx->buffer_mutex);

// fix extended data in case the caller screwed it up
av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO);
f = &p->released_buffers[--p->num_released_buffers];
f->extended_data = f->data;
av_frame_unref(f);

pthread_mutex_unlock(&fctx->buffer_mutex);
}
}

static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
{
FrameThreadContext *fctx = p->parent;
PerThreadContext *prev_thread = fctx->prev_thread;
const AVCodec *codec = p->avctx->codec;

if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;

pthread_mutex_lock(&p->mutex);

release_delayed_buffers(p);

if (prev_thread) {
int err;
if (prev_thread->state == STATE_SETTING_UP) {
pthread_mutex_lock(&prev_thread->progress_mutex);
while (prev_thread->state == STATE_SETTING_UP)
pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
pthread_mutex_unlock(&prev_thread->progress_mutex);
}

err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
if (err) {
pthread_mutex_unlock(&p->mutex);
return err;
}
}

av_buffer_unref(&p->avpkt.buf);
p->avpkt = *avpkt;
if (avpkt->buf)
p->avpkt.buf = av_buffer_ref(avpkt->buf);
else {
av_fast_malloc(&p->buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
p->avpkt.data = p->buf;
memcpy(p->buf, avpkt->data, avpkt->size);
memset(p->buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}

p->state = STATE_SETTING_UP;
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);

/*
* If the client doesn't have a thread-safe get_buffer(),
* then decoding threads call back to the main thread,
* and it calls back to the client here.
*/

FF_DISABLE_DEPRECATION_WARNINGS
if (!p->avctx->thread_safe_callbacks && (
#if FF_API_GET_BUFFER
p->avctx->get_buffer ||
#endif
p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
FF_ENABLE_DEPRECATION_WARNINGS
while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state == STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

if (p->state == STATE_GET_BUFFER) {
p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
p->state = STATE_SETTING_UP;
pthread_cond_signal(&p->progress_cond);
}
pthread_mutex_unlock(&p->progress_mutex);
}
}

fctx->prev_thread = p;
fctx->next_decoding++;

return 0;
}

int ff_thread_decode_frame(AVCodecContext *avctx,
AVFrame *picture, int *got_picture_ptr,
AVPacket *avpkt)
{
FrameThreadContext *fctx = avctx->thread_opaque;
int finished = fctx->next_finished;
PerThreadContext *p;
int err;

/*
* Submit a packet to the next decoding thread.
*/

p = &fctx->threads[fctx->next_decoding];
err = update_context_from_user(p->avctx, avctx);
if (err) return err;
err = submit_packet(p, avpkt);
if (err) return err;

/*
* If we're still receiving the initial packets, don't return a frame.
*/

if (fctx->delaying) {
if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;

*got_picture_ptr=0;
if (avpkt->size)
return avpkt->size;
}

/*
* Return the next available frame from the oldest thread.
* If we're at the end of the stream, then we have to skip threads that
* didn't output a frame, because we don't want to accidentally signal
* EOF (avpkt->size == 0 && *got_picture_ptr == 0).
*/

do {
p = &fctx->threads[finished++];

if (p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}

av_frame_move_ref(picture, &p->frame);
*got_picture_ptr = p->got_frame;
picture->pkt_dts = p->avpkt.dts;

/*
* A later call with avkpt->size == 0 may loop over all threads,
* including this one, searching for a frame to return before being
* stopped by the "finished != fctx->next_finished" condition.
* Make sure we don't mistakenly return the same frame again.
*/
p->got_frame = 0;

if (finished >= avctx->thread_count) finished = 0;
} while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);

update_context_from_thread(avctx, p->avctx, 1);

if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;

fctx->next_finished = finished;

/* return the size of the consumed packet if no error occurred */
return (p->result >= 0) ? avpkt->size : p->result;
}

void ff_thread_report_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->progress ? (int*)f->progress->data : NULL;

if (!progress || progress[field] >= n) return;

p = f->owner->thread_opaque;

if (f->owner->debug&FF_DEBUG_THREADS)
av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);

pthread_mutex_lock(&p->progress_mutex);
progress[field] = n;
pthread_cond_broadcast(&p->progress_cond);
pthread_mutex_unlock(&p->progress_mutex);
}

void ff_thread_await_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->progress ? (int*)f->progress->data : NULL;

if (!progress || progress[field] >= n) return;

p = f->owner->thread_opaque;

if (f->owner->debug&FF_DEBUG_THREADS)
av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);

pthread_mutex_lock(&p->progress_mutex);
while (progress[field] < n)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}

void ff_thread_finish_setup(AVCodecContext *avctx) {
PerThreadContext *p = avctx->thread_opaque;

if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;

pthread_mutex_lock(&p->progress_mutex);
p->state = STATE_SETUP_FINISHED;
pthread_cond_broadcast(&p->progress_cond);
pthread_mutex_unlock(&p->progress_mutex);
}

/// Waits for all threads to finish.
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
{
int i;

for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];

if (p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}
}
}

void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
{
FrameThreadContext *fctx = avctx->thread_opaque;
const AVCodec *codec = avctx->codec;
int i;

park_frame_worker_threads(fctx, thread_count);

if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);

fctx->die = 1;

for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];

pthread_mutex_lock(&p->mutex);
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);

if (p->thread_init)
pthread_join(p->thread, NULL);

if (codec->close)
codec->close(p->avctx);

avctx->codec = NULL;

release_delayed_buffers(p);
av_frame_unref(&p->frame);
}

for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];

pthread_mutex_destroy(&p->mutex);
pthread_mutex_destroy(&p->progress_mutex);
pthread_cond_destroy(&p->input_cond);
pthread_cond_destroy(&p->progress_cond);
pthread_cond_destroy(&p->output_cond);
av_buffer_unref(&p->avpkt.buf);
av_freep(&p->buf);
av_freep(&p->released_buffers);

if (i) {
av_freep(&p->avctx->priv_data);
av_freep(&p->avctx->internal);
av_freep(&p->avctx->slice_offset);
}

av_freep(&p->avctx);
}

av_freep(&fctx->threads);
pthread_mutex_destroy(&fctx->buffer_mutex);
av_freep(&avctx->thread_opaque);
}

int ff_frame_thread_init(AVCodecContext *avctx)
{
int thread_count = avctx->thread_count;
const AVCodec *codec = avctx->codec;
AVCodecContext *src = avctx;
FrameThreadContext *fctx;
int i, err = 0;

#if HAVE_W32THREADS
w32thread_init();
#endif

if (!thread_count) {
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
else
thread_count = avctx->thread_count = 1;
}

if (thread_count <= 1) {
avctx->active_thread_type = 0;
return 0;
}

avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));

fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
pthread_mutex_init(&fctx->buffer_mutex, NULL);
fctx->delaying = 1;

for (i = 0; i < thread_count; i++) {
AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
PerThreadContext *p = &fctx->threads[i];

pthread_mutex_init(&p->mutex, NULL);
pthread_mutex_init(&p->progress_mutex, NULL);
pthread_cond_init(&p->input_cond, NULL);
pthread_cond_init(&p->progress_cond, NULL);
pthread_cond_init(&p->output_cond, NULL);

p->parent = fctx;
p->avctx = copy;

if (!copy) {
err = AVERROR(ENOMEM);
goto error;
}

*copy = *src;
copy->thread_opaque = p;
copy->pkt = &p->avpkt;

if (!i) {
src = copy;

if (codec->init)
err = codec->init(copy);

update_context_from_thread(avctx, copy, 1);
} else {
copy->priv_data = av_malloc(codec->priv_data_size);
if (!copy->priv_data) {
err = AVERROR(ENOMEM);
goto error;
}
memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
copy->internal = av_malloc(sizeof(AVCodecInternal));
if (!copy->internal) {
err = AVERROR(ENOMEM);
goto error;
}
*copy->internal = *src->internal;
copy->internal->is_copy = 1;

if (codec->init_thread_copy)
err = codec->init_thread_copy(copy);
}

if (err) goto error;

if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
p->thread_init = 1;
}

return 0;

error:
ff_frame_thread_free(avctx, i+1);

return err;
}

void ff_thread_flush(AVCodecContext *avctx)
{
int i;
FrameThreadContext *fctx = avctx->thread_opaque;

if (!avctx->thread_opaque) return;

park_frame_worker_threads(fctx, avctx->thread_count);
if (fctx->prev_thread) {
if (fctx->prev_thread != &fctx->threads[0])
update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
if (avctx->codec->flush)
avctx->codec->flush(fctx->threads[0].avctx);
}

fctx->next_decoding = fctx->next_finished = 0;
fctx->delaying = 1;
fctx->prev_thread = NULL;
for (i = 0; i < avctx->thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
// Make sure decode flush calls with size=0 won't return old frames
p->got_frame = 0;
av_frame_unref(&p->frame);

release_delayed_buffers(p);
}
}

int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
PerThreadContext *p = avctx->thread_opaque;
int err;

f->owner = avctx;

if (!(avctx->active_thread_type & FF_THREAD_FRAME))
return ff_get_buffer(avctx, f->f, flags);

if (p->state != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
return -1;
}

if (avctx->internal->allocate_progress) {
int *progress;
f->progress = av_buffer_alloc(2 * sizeof(int));
if (!f->progress) {
return AVERROR(ENOMEM);
}
progress = (int*)f->progress->data;

progress[0] = progress[1] = -1;
}

pthread_mutex_lock(&p->parent->buffer_mutex);
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->thread_safe_callbacks || (
#if FF_API_GET_BUFFER
!avctx->get_buffer &&
#endif
avctx->get_buffer2 == avcodec_default_get_buffer2)) {
FF_ENABLE_DEPRECATION_WARNINGS
err = ff_get_buffer(avctx, f->f, flags);
} else {
p->requested_frame = f->f;
p->requested_flags = flags;
p->state = STATE_GET_BUFFER;
pthread_mutex_lock(&p->progress_mutex);
pthread_cond_signal(&p->progress_cond);

while (p->state != STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);

err = p->result;

pthread_mutex_unlock(&p->progress_mutex);

}
if (!avctx->thread_safe_callbacks && !avctx->codec->update_thread_context)
ff_thread_finish_setup(avctx);

if (err)
av_buffer_unref(&f->progress);

pthread_mutex_unlock(&p->parent->buffer_mutex);

return err;
}

void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
{
PerThreadContext *p = avctx->thread_opaque;
FrameThreadContext *fctx;
AVFrame *dst, *tmp;
FF_DISABLE_DEPRECATION_WARNINGS
int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
avctx->thread_safe_callbacks ||
(
#if FF_API_GET_BUFFER
!avctx->get_buffer &&
#endif
avctx->get_buffer2 == avcodec_default_get_buffer2);
FF_ENABLE_DEPRECATION_WARNINGS

if (!f->f->data[0])
return;

if (avctx->debug & FF_DEBUG_BUFFERS)
av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);

av_buffer_unref(&f->progress);
f->owner = NULL;

if (can_direct_free) {
av_frame_unref(f->f);
return;
}

fctx = p->parent;
pthread_mutex_lock(&fctx->buffer_mutex);

if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
goto fail;
tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
(p->num_released_buffers + 1) *
sizeof(*p->released_buffers));
if (!tmp)
goto fail;
p->released_buffers = tmp;

dst = &p->released_buffers[p->num_released_buffers];
av_frame_move_ref(dst, f->f);

p->num_released_buffers++;

fail:
pthread_mutex_unlock(&fctx->buffer_mutex);
}

+ 34
- 0
libavcodec/pthread_internal.h View File

@@ -0,0 +1,34 @@
/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef AVCODEC_PTHREAD_INTERNAL_H
#define AVCODEC_PTHREAD_INTERNAL_H

#include "avcodec.h"

/* H264 slice threading seems to be buggy with more than 16 threads,
* limit the number of threads to 16 for automatic detection */
#define MAX_AUTO_THREADS 16

int ff_slice_thread_init(AVCodecContext *avctx);
void ff_slice_thread_free(AVCodecContext *avctx);

int ff_frame_thread_init(AVCodecContext *avctx);
void ff_frame_thread_free(AVCodecContext *avctx, int thread_count);

#endif // AVCODEC_PTHREAD_INTERNAL_H

+ 224
- 0
libavcodec/pthread_slice.c View File

@@ -0,0 +1,224 @@
/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/**
* @file
* Slice multithreading support functions
* @see doc/multithreading.txt
*/

#include "config.h"

#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "compat/w32pthreads.h"
#endif

#include "avcodec.h"
#include "internal.h"
#include "pthread_internal.h"
#include "thread.h"

#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/mem.h"

typedef int (action_func)(AVCodecContext *c, void *arg);
typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);

typedef struct ThreadContext {
pthread_t *workers;
action_func *func;
action_func2 *func2;
void *args;
int *rets;
int rets_count;
int job_count;
int job_size;

pthread_cond_t last_job_cond;
pthread_cond_t current_job_cond;
pthread_mutex_t current_job_lock;
unsigned current_execute;
int current_job;
int done;
} ThreadContext;

static void* attribute_align_arg worker(void *v)
{
AVCodecContext *avctx = v;
ThreadContext *c = avctx->thread_opaque;
unsigned last_execute = 0;
int our_job = c->job_count;
int thread_count = avctx->thread_count;
int self_id;

pthread_mutex_lock(&c->current_job_lock);
self_id = c->current_job++;
for (;;){
while (our_job >= c->job_count) {
if (c->current_job == thread_count + c->job_count)
pthread_cond_signal(&c->last_job_cond);

while (last_execute == c->current_execute && !c->done)
pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
last_execute = c->current_execute;
our_job = self_id;

if (c->done) {
pthread_mutex_unlock(&c->current_job_lock);
return NULL;
}
}
pthread_mutex_unlock(&c->current_job_lock);

c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
c->func2(avctx, c->args, our_job, self_id);

pthread_mutex_lock(&c->current_job_lock);
our_job = c->current_job++;
}
}

void ff_slice_thread_free(AVCodecContext *avctx)
{
ThreadContext *c = avctx->thread_opaque;
int i;

pthread_mutex_lock(&c->current_job_lock);
c->done = 1;
pthread_cond_broadcast(&c->current_job_cond);
pthread_mutex_unlock(&c->current_job_lock);

for (i=0; i<avctx->thread_count; i++)
pthread_join(c->workers[i], NULL);

pthread_mutex_destroy(&c->current_job_lock);
pthread_cond_destroy(&c->current_job_cond);
pthread_cond_destroy(&c->last_job_cond);
av_free(c->workers);
av_freep(&avctx->thread_opaque);
}

static av_always_inline void thread_park_workers(ThreadContext *c, int thread_count)
{
while (c->current_job != thread_count + c->job_count)
pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
pthread_mutex_unlock(&c->current_job_lock);
}

static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
{
ThreadContext *c= avctx->thread_opaque;
int dummy_ret;

if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);

if (job_count <= 0)
return 0;

pthread_mutex_lock(&c->current_job_lock);

c->current_job = avctx->thread_count;
c->job_count = job_count;
c->job_size = job_size;
c->args = arg;
c->func = func;
if (ret) {
c->rets = ret;
c->rets_count = job_count;
} else {
c->rets = &dummy_ret;
c->rets_count = 1;
}
c->current_execute++;
pthread_cond_broadcast(&c->current_job_cond);

thread_park_workers(c, avctx->thread_count);

return 0;
}

static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
{
ThreadContext *c= avctx->thread_opaque;
c->func2 = func2;
return thread_execute(avctx, NULL, arg, ret, job_count, 0);
}

int ff_slice_thread_init(AVCodecContext *avctx)
{
int i;
ThreadContext *c;
int thread_count = avctx->thread_count;

#if HAVE_W32THREADS
w32thread_init();
#endif

if (!thread_count) {
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
else
thread_count = avctx->thread_count = 1;
}

if (thread_count <= 1) {
avctx->active_thread_type = 0;
return 0;
}

c = av_mallocz(sizeof(ThreadContext));
if (!c)
return -1;

c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
if (!c->workers) {
av_free(c);
return -1;
}

avctx->thread_opaque = c;
c->current_job = 0;
c->job_count = 0;
c->job_size = 0;
c->done = 0;
pthread_cond_init(&c->current_job_cond, NULL);
pthread_cond_init(&c->last_job_cond, NULL);
pthread_mutex_init(&c->current_job_lock, NULL);
pthread_mutex_lock(&c->current_job_lock);
for (i=0; i<thread_count; i++) {
if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
avctx->thread_count = i;
pthread_mutex_unlock(&c->current_job_lock);
ff_thread_free(avctx);
return -1;
}
}

thread_park_workers(c, thread_count);

avctx->execute = thread_execute;
avctx->execute2 = thread_execute2;
return 0;
}

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