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FFmpeg
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* Moving FifoBuffer out of libavformat/avformat.h and 

libavformat/utils.c into libavutil

Originally committed as revision 6310 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Roman Shaposhnik 19 years ago
parent
a1ef006823
commit
f5a478f65d
9 changed files with 212 additions and 219 deletions
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  1. +12
    -14
      ffmpeg.c
  2. +0
    -23
      libavformat/avformat.h
  3. +11
    -10
      libavformat/dvenc.c
  4. +8
    -7
      libavformat/gxfenc.c
  5. +19
    -24
      libavformat/mpeg.c
  6. +0
    -140
      libavformat/utils.c
  7. +2
    -1
      libavutil/Makefile
  8. +135
    -0
      libavutil/fifo.c
  9. +25
    -0
      libavutil/fifo.h

+ 12
- 14
ffmpeg.c View File

@@ -23,6 +23,7 @@
#include "framehook.h"
#include "dsputil.h"
#include "opt.h"
#include "fifo.h"

#ifndef __MINGW32__
#include <unistd.h>
@@ -267,7 +268,7 @@ typedef struct AVOutputStream {
/* audio only */
int audio_resample;
ReSampleContext *resample; /* for audio resampling */
FifoBuffer fifo; /* for compression: one audio fifo per codec */
AVFifoBuffer fifo; /* for compression: one audio fifo per codec */
FILE *logfile;
} AVOutputStream;

@@ -471,7 +472,7 @@ static void do_audio_out(AVFormatContext *s,

if(audio_sync_method){
double delta = get_sync_ipts(ost) * enc->sample_rate - ost->sync_opts
- fifo_size(&ost->fifo, ost->fifo.rptr)/(ost->st->codec->channels * 2);
- av_fifo_size(&ost->fifo)/(ost->st->codec->channels * 2);
double idelta= delta*ist->st->codec->sample_rate / enc->sample_rate;
int byte_delta= ((int)idelta)*2*ist->st->codec->channels;

@@ -508,13 +509,13 @@ static void do_audio_out(AVFormatContext *s,
assert(ost->audio_resample);
if(verbose > 2)
fprintf(stderr, "compensating audio timestamp drift:%f compensation:%d in:%d\n", delta, comp, enc->sample_rate);
// fprintf(stderr, "drift:%f len:%d opts:%lld ipts:%lld fifo:%d\n", delta, -1, ost->sync_opts, (int64_t)(get_sync_ipts(ost) * enc->sample_rate), fifo_size(&ost->fifo, ost->fifo.rptr)/(ost->st->codec->channels * 2));
// fprintf(stderr, "drift:%f len:%d opts:%lld ipts:%lld fifo:%d\n", delta, -1, ost->sync_opts, (int64_t)(get_sync_ipts(ost) * enc->sample_rate), av_fifo_size(&ost->fifo)/(ost->st->codec->channels * 2));
av_resample_compensate(*(struct AVResampleContext**)ost->resample, comp, enc->sample_rate);
}
}
}else
ost->sync_opts= lrintf(get_sync_ipts(ost) * enc->sample_rate)
- fifo_size(&ost->fifo, ost->fifo.rptr)/(ost->st->codec->channels * 2); //FIXME wrong
- av_fifo_size(&ost->fifo)/(ost->st->codec->channels * 2); //FIXME wrong

if (ost->audio_resample) {
buftmp = audio_buf;
@@ -530,13 +531,11 @@ static void do_audio_out(AVFormatContext *s,
/* now encode as many frames as possible */
if (enc->frame_size > 1) {
/* output resampled raw samples */
fifo_write(&ost->fifo, buftmp, size_out,
&ost->fifo.wptr);
av_fifo_write(&ost->fifo, buftmp, size_out);

frame_bytes = enc->frame_size * 2 * enc->channels;

while (fifo_read(&ost->fifo, audio_buf, frame_bytes,
&ost->fifo.rptr) == 0) {
while (av_fifo_read(&ost->fifo, audio_buf, frame_bytes) == 0) {
AVPacket pkt;
av_init_packet(&pkt);

@@ -1317,14 +1316,13 @@ static int output_packet(AVInputStream *ist, int ist_index,

switch(ost->st->codec->codec_type) {
case CODEC_TYPE_AUDIO:
fifo_bytes = fifo_size(&ost->fifo, NULL);
fifo_bytes = av_fifo_size(&ost->fifo);
ret = 0;
/* encode any samples remaining in fifo */
if(fifo_bytes > 0 && enc->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {
int fs_tmp = enc->frame_size;
enc->frame_size = fifo_bytes / (2 * enc->channels);
if(fifo_read(&ost->fifo, (uint8_t *)samples, fifo_bytes,
&ost->fifo.rptr) == 0) {
if(av_fifo_read(&ost->fifo, (uint8_t *)samples, fifo_bytes) == 0) {
ret = avcodec_encode_audio(enc, bit_buffer, bit_buffer_size, samples);
}
enc->frame_size = fs_tmp;
@@ -1563,7 +1561,7 @@ static int av_encode(AVFormatContext **output_files,
} else {
switch(codec->codec_type) {
case CODEC_TYPE_AUDIO:
if (fifo_init(&ost->fifo, 2 * MAX_AUDIO_PACKET_SIZE))
if (av_fifo_init(&ost->fifo, 2 * MAX_AUDIO_PACKET_SIZE))
goto fail;

if (codec->channels == icodec->channels &&
@@ -2018,8 +2016,8 @@ static int av_encode(AVFormatContext **output_files,
fclose(ost->logfile);
ost->logfile = NULL;
}
fifo_free(&ost->fifo); /* works even if fifo is not
initialized but set to zero */
av_fifo_free(&ost->fifo); /* works even if fifo is not
initialized but set to zero */
av_free(ost->pict_tmp.data[0]);
if (ost->video_resample)
sws_freeContext(ost->img_resample_ctx);


+ 0
- 23
libavformat/avformat.h View File

@@ -441,29 +441,6 @@ void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);

void av_register_all(void);

typedef struct FifoBuffer {
uint8_t *buffer;
uint8_t *rptr, *wptr, *end;
} FifoBuffer;

int fifo_init(FifoBuffer *f, int size);
void fifo_free(FifoBuffer *f);
int fifo_size(FifoBuffer *f, uint8_t *rptr);
int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr);
void fifo_write(FifoBuffer *f, const uint8_t *buf, int size, uint8_t **wptr_ptr);
int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr);
void fifo_realloc(FifoBuffer *f, unsigned int size);
static inline uint8_t fifo_peek(FifoBuffer *f, int offs)
{
return f->buffer[(f->rptr - f->buffer + offs) % (f->end - f->buffer)];
}
static inline void fifo_drain(FifoBuffer *f, int size)
{
f->rptr += size;
if (f->rptr >= f->end)
f->rptr = f->buffer + (f->rptr - f->end);
}

/* media file input */
AVInputFormat *av_find_input_format(const char *short_name);
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);


+ 11
- 10
libavformat/dvenc.c View File

@@ -29,12 +29,13 @@
#include "avformat.h"
#include "dvdata.h"
#include "dv.h"
#include "fifo.h"

struct DVMuxContext {
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
int n_ast; /* Number of stereo audio streams (up to 2) */
AVStream *ast[2]; /* Stereo audio streams */
FifoBuffer audio_data[2]; /* Fifo for storing excessive amounts of PCM */
AVFifoBuffer audio_data[2]; /* Fifo for storing excessive amounts of PCM */
int frames; /* Number of a current frame */
time_t start_time; /* Start time of recording */
int has_audio; /* frame under contruction has audio */
@@ -185,8 +186,8 @@ static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
if (of*2 >= size)
continue;

frame_ptr[d] = fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: may be we have to admit
frame_ptr[d+1] = fifo_peek(&c->audio_data[channel], of*2); // that DV is a big endian PCM
frame_ptr[d] = av_fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: may be we have to admit
frame_ptr[d+1] = av_fifo_peek(&c->audio_data[channel], of*2); // that DV is a big endian PCM
}
frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}
@@ -247,12 +248,12 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st,
for (i = 0; i < c->n_ast && st != c->ast[i]; i++);

/* FIXME: we have to have more sensible approach than this one */
if (fifo_size(&c->audio_data[i], c->audio_data[i].rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
if (av_fifo_size(&c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
fifo_write(&c->audio_data[i], data, data_size, &c->audio_data[i].wptr);
av_fifo_write(&c->audio_data[i], data, data_size);

/* Lets see if we've got enough audio for one DV frame */
c->has_audio |= ((reqasize <= fifo_size(&c->audio_data[i], c->audio_data[i].rptr)) << i);
c->has_audio |= ((reqasize <= av_fifo_size(&c->audio_data[i])) << i);

break;
default:
@@ -264,7 +265,7 @@ int dv_assemble_frame(DVMuxContext *c, AVStream* st,
dv_inject_metadata(c, *frame);
for (i=0; i<c->n_ast; i++) {
dv_inject_audio(c, i, *frame);
fifo_drain(&c->audio_data[i], reqasize);
av_fifo_drain(&c->audio_data[i], reqasize);
}

c->has_video = 0;
@@ -333,10 +334,10 @@ DVMuxContext* dv_init_mux(AVFormatContext* s)
c->start_time = (time_t)s->timestamp;

for (i=0; i<c->n_ast; i++) {
if (c->ast[i] && fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) {
if (c->ast[i] && av_fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) {
while (i>0) {
i--;
fifo_free(&c->audio_data[i]);
av_fifo_free(&c->audio_data[i]);
}
goto bail_out;
}
@@ -353,7 +354,7 @@ void dv_delete_mux(DVMuxContext *c)
{
int i;
for (i=0; i < c->n_ast; i++)
fifo_free(&c->audio_data[i]);
av_fifo_free(&c->audio_data[i]);
}

#ifdef CONFIG_MUXERS


+ 8
- 7
libavformat/gxfenc.c View File

@@ -20,12 +20,13 @@
#include "avformat.h"
#include "gxf.h"
#include "riff.h"
#include "fifo.h"

#define GXF_AUDIO_PACKET_SIZE 65536

typedef struct GXFStreamContext {
AVCodecContext *codec;
FifoBuffer audio_buffer;
AVFifoBuffer audio_buffer;
uint32_t track_type;
uint32_t sample_size;
uint32_t sample_rate;
@@ -604,7 +605,7 @@ static int gxf_write_header(AVFormatContext *s)
sc->fields = -2;
gxf->audio_tracks++;
gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
fifo_init(&sc->audio_buffer, 3*GXF_AUDIO_PACKET_SIZE);
av_fifo_init(&sc->audio_buffer, 3*GXF_AUDIO_PACKET_SIZE);
} else if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
/* FIXME check from time_base ? */
if (sc->codec->height == 480 || sc->codec->height == 512) { /* NTSC or NTSC+VBI */
@@ -670,7 +671,7 @@ static int gxf_write_trailer(AVFormatContext *s)

for (i = 0; i < s->nb_streams; ++i) {
if (s->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO) {
fifo_free(&gxf->streams[i].audio_buffer);
av_fifo_free(&gxf->streams[i].audio_buffer);
}
if (s->streams[i]->codec->frame_number > gxf->nb_frames)
gxf->nb_frames = 2 * s->streams[i]->codec->frame_number;
@@ -762,12 +763,12 @@ static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)

static int gxf_new_audio_packet(GXFContext *gxf, GXFStreamContext *sc, AVPacket *pkt, int flush)
{
int size = flush ? fifo_size(&sc->audio_buffer, NULL) : GXF_AUDIO_PACKET_SIZE;
int size = flush ? av_fifo_size(&sc->audio_buffer) : GXF_AUDIO_PACKET_SIZE;

if (!size)
return 0;
av_new_packet(pkt, size);
fifo_read(&sc->audio_buffer, pkt->data, size, NULL);
av_fifo_read(&sc->audio_buffer, pkt->data, size);
pkt->stream_index = sc->index;
pkt->dts = sc->current_dts;
sc->current_dts += size / 2; /* we only support 16 bit pcm mono for now */
@@ -784,10 +785,10 @@ static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pk
if (s->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO) {
GXFStreamContext *sc = &gxf->streams[i];
if (pkt && pkt->stream_index == i) {
fifo_write(&sc->audio_buffer, pkt->data, pkt->size, NULL);
av_fifo_write(&sc->audio_buffer, pkt->data, pkt->size);
pkt = NULL;
}
if (flush || fifo_size(&sc->audio_buffer, NULL) >= GXF_AUDIO_PACKET_SIZE) {
if (flush || av_fifo_size(&sc->audio_buffer) >= GXF_AUDIO_PACKET_SIZE) {
if (gxf_new_audio_packet(gxf, sc, &new_pkt, flush) > 0) {
pkt = &new_pkt;
break; /* add pkt right now into list */


+ 19
- 24
libavformat/mpeg.c View File

@@ -18,6 +18,7 @@
*/
#include "avformat.h"
#include "bitstream.h"
#include "fifo.h"

#define MAX_PAYLOAD_SIZE 4096
//#define DEBUG_SEEK
@@ -35,7 +36,7 @@ typedef struct PacketDesc {
} PacketDesc;

typedef struct {
FifoBuffer fifo;
AVFifoBuffer fifo;
uint8_t id;
int max_buffer_size; /* in bytes */
int buffer_index;
@@ -45,7 +46,7 @@ typedef struct {
int packet_number;
uint8_t lpcm_header[3];
int lpcm_align;
uint8_t *fifo_iframe_ptr;
int bytes_to_iframe;
int align_iframe;
int64_t vobu_start_pts;
} StreamInfo;
@@ -412,7 +413,7 @@ static int mpeg_mux_init(AVFormatContext *ctx)
default:
return -1;
}
fifo_init(&stream->fifo, 16);
av_fifo_init(&stream->fifo, 16);
}
bitrate = 0;
audio_bitrate = 0;
@@ -708,14 +709,7 @@ static int flush_packet(AVFormatContext *ctx, int stream_index,
}
} else if (s->is_dvd) {
if (stream->align_iframe || s->packet_number == 0){
int bytes_to_iframe;
int PES_bytes_to_fill;
if (stream->fifo_iframe_ptr >= stream->fifo.rptr) {
bytes_to_iframe = stream->fifo_iframe_ptr - stream->fifo.rptr;
} else {
bytes_to_iframe = (stream->fifo.end - stream->fifo.rptr) + (stream->fifo_iframe_ptr - stream->fifo.buffer);
}
PES_bytes_to_fill = s->packet_size - size - 10;
int PES_bytes_to_fill = s->packet_size - size - 10;

if (pts != AV_NOPTS_VALUE) {
if (dts != pts)
@@ -724,7 +718,7 @@ static int flush_packet(AVFormatContext *ctx, int stream_index,
PES_bytes_to_fill -= 5;
}

if (bytes_to_iframe == 0 || s->packet_number == 0) {
if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
size = put_system_header(ctx, buf_ptr, 0);
buf_ptr += size;
size = buf_ptr - buffer;
@@ -751,8 +745,8 @@ static int flush_packet(AVFormatContext *ctx, int stream_index,
s->last_scr= scr;
buf_ptr += size;
/* GOP Start */
} else if (bytes_to_iframe < PES_bytes_to_fill) {
pad_packet_bytes = PES_bytes_to_fill - bytes_to_iframe;
} else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
}
}
} else {
@@ -824,7 +818,7 @@ static int flush_packet(AVFormatContext *ctx, int stream_index,
startcode = 0x100 + id;
}

stuffing_size = payload_size - fifo_size(&stream->fifo, stream->fifo.rptr);
stuffing_size = payload_size - av_fifo_size(&stream->fifo);

// first byte doesnt fit -> reset pts/dts + stuffing
if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
@@ -951,8 +945,9 @@ static int flush_packet(AVFormatContext *ctx, int stream_index,
}

/* output data */
if(put_fifo(&ctx->pb, &stream->fifo, payload_size - stuffing_size, &stream->fifo.rptr) < 0)
if(av_fifo_generic_read(&stream->fifo, payload_size - stuffing_size, &put_buffer, &ctx->pb) < 0)
return -1;
stream->bytes_to_iframe -= payload_size - stuffing_size;
}else{
payload_size=
stuffing_size= 0;
@@ -1065,7 +1060,7 @@ retry:
for(i=0; i<ctx->nb_streams; i++){
AVStream *st = ctx->streams[i];
StreamInfo *stream = st->priv_data;
const int avail_data= fifo_size(&stream->fifo, stream->fifo.rptr);
const int avail_data= av_fifo_size(&stream->fifo);
const int space= stream->max_buffer_size - stream->buffer_index;
int rel_space= 1024*space / stream->max_buffer_size;
PacketDesc *next_pkt= stream->premux_packet;
@@ -1125,7 +1120,7 @@ retry:
st = ctx->streams[best_i];
stream = st->priv_data;

assert(fifo_size(&stream->fifo, stream->fifo.rptr) > 0);
assert(av_fifo_size(&stream->fifo) > 0);

assert(avail_space >= s->packet_size || ignore_constraints);

@@ -1141,7 +1136,7 @@ retry:
//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
}else{
assert(fifo_size(&stream->fifo, stream->fifo.rptr) == trailer_size);
assert(av_fifo_size(&stream->fifo) == trailer_size);
es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
}

@@ -1204,11 +1199,11 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
stream->predecode_packet= pkt_desc;
stream->next_packet= &pkt_desc->next;

fifo_realloc(&stream->fifo, fifo_size(&stream->fifo, NULL) + size + 1);
av_fifo_realloc(&stream->fifo, av_fifo_size(&stream->fifo) + size + 1);

if (s->is_dvd){
if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
stream->fifo_iframe_ptr = stream->fifo.wptr;
stream->bytes_to_iframe = av_fifo_size(&stream->fifo);
stream->align_iframe = 1;
stream->vobu_start_pts = pts;
} else {
@@ -1216,7 +1211,7 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
}
}

fifo_write(&stream->fifo, buf, size, &stream->fifo.wptr);
av_fifo_write(&stream->fifo, buf, size);

for(;;){
int ret= output_packet(ctx, 0);
@@ -1248,8 +1243,8 @@ static int mpeg_mux_end(AVFormatContext *ctx)
for(i=0;i<ctx->nb_streams;i++) {
stream = ctx->streams[i]->priv_data;

assert(fifo_size(&stream->fifo, stream->fifo.rptr) == 0);
fifo_free(&stream->fifo);
assert(av_fifo_size(&stream->fifo) == 0);
av_fifo_free(&stream->fifo);
}
return 0;
}


+ 0
- 140
libavformat/utils.c View File

@@ -263,146 +263,6 @@ int av_dup_packet(AVPacket *pkt)
return 0;
}

/* fifo handling */

int fifo_init(FifoBuffer *f, int size)
{
f->buffer = av_malloc(size);
if (!f->buffer)
return -1;
f->end = f->buffer + size;
f->wptr = f->rptr = f->buffer;
return 0;
}

void fifo_free(FifoBuffer *f)
{
av_free(f->buffer);
}

int fifo_size(FifoBuffer *f, uint8_t *rptr)
{
int size;

if(!rptr)
rptr= f->rptr;

if (f->wptr >= rptr) {
size = f->wptr - rptr;
} else {
size = (f->end - rptr) + (f->wptr - f->buffer);
}
return size;
}

/**
* Get data from the fifo (returns -1 if not enough data).
*/
int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr)
{
uint8_t *rptr;
int size, len;

if(!rptr_ptr)
rptr_ptr= &f->rptr;
rptr = *rptr_ptr;

if (f->wptr >= rptr) {
size = f->wptr - rptr;
} else {
size = (f->end - rptr) + (f->wptr - f->buffer);
}

if (size < buf_size)
return -1;
while (buf_size > 0) {
len = f->end - rptr;
if (len > buf_size)
len = buf_size;
memcpy(buf, rptr, len);
buf += len;
rptr += len;
if (rptr >= f->end)
rptr = f->buffer;
buf_size -= len;
}
*rptr_ptr = rptr;
return 0;
}

/**
* Resizes a FIFO.
*/
void fifo_realloc(FifoBuffer *f, unsigned int new_size){
unsigned int old_size= f->end - f->buffer;

if(old_size < new_size){
uint8_t *old= f->buffer;

f->buffer= av_realloc(f->buffer, new_size);

f->rptr += f->buffer - old;
f->wptr += f->buffer - old;

if(f->wptr < f->rptr){
memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
f->rptr += new_size - old_size;
}
f->end= f->buffer + new_size;
}
}

void fifo_write(FifoBuffer *f, const uint8_t *buf, int size, uint8_t **wptr_ptr)
{
int len;
uint8_t *wptr;

if(!wptr_ptr)
wptr_ptr= &f->wptr;
wptr = *wptr_ptr;

while (size > 0) {
len = f->end - wptr;
if (len > size)
len = size;
memcpy(wptr, buf, len);
wptr += len;
if (wptr >= f->end)
wptr = f->buffer;
buf += len;
size -= len;
}
*wptr_ptr = wptr;
}

/* get data from the fifo (return -1 if not enough data) */
int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr)
{
uint8_t *rptr = *rptr_ptr;
int size, len;

if (f->wptr >= rptr) {
size = f->wptr - rptr;
} else {
size = (f->end - rptr) + (f->wptr - f->buffer);
}

if (size < buf_size)
return -1;
while (buf_size > 0) {
len = f->end - rptr;
if (len > buf_size)
len = buf_size;
put_buffer(pb, rptr, len);
rptr += len;
if (rptr >= f->end)
rptr = f->buffer;
buf_size -= len;
}
*rptr_ptr = rptr;
return 0;
}

/**
* Allocate the payload of a packet and intialized its fields to default values.
*


+ 2
- 1
libavutil/Makefile View File

@@ -16,9 +16,10 @@ OBJS= mathematics.o \
adler32.o \
log.o \
mem.o \
fifo.o \

HEADERS = avutil.h common.h mathematics.h integer.h rational.h \
intfloat_readwrite.h md5.h adler32.h log.h
intfloat_readwrite.h md5.h adler32.h log.h fifo.h

NAME=avutil
ifeq ($(BUILD_SHARED),yes)


+ 135
- 0
libavutil/fifo.c View File

@@ -0,0 +1,135 @@
/*
* A very simple circular buffer FIFO implementation
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
* Copyright (c) 2006 Roman Shaposhnik
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "common.h"
#include "fifo.h"

int av_fifo_init(AVFifoBuffer *f, int size)
{
f->buffer = av_malloc(size);
if (!f->buffer)
return -1;
f->end = f->buffer + size;
f->wptr = f->rptr = f->buffer;
return 0;
}

void av_fifo_free(AVFifoBuffer *f)
{
av_free(f->buffer);
}

int av_fifo_size(AVFifoBuffer *f)
{
int size = f->wptr - f->rptr;
if (size < 0)
size += f->end - f->buffer;
return size;
}

/**
* Get data from the fifo (returns -1 if not enough data).
*/
int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size)
{
int len;
int size = f->wptr - f->rptr;
if (size < 0)
size += f->end - f->buffer;

if (size < buf_size)
return -1;
while (buf_size > 0) {
len = FFMIN(f->end - f->rptr, buf_size);
memcpy(buf, f->rptr, len);
buf += len;
f->rptr += len;
if (f->rptr >= f->end)
f->rptr = f->buffer;
buf_size -= len;
}
return 0;
}

/**
* Resizes a FIFO.
*/
void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) {
unsigned int old_size= f->end - f->buffer;

if(old_size < new_size){
uint8_t *old= f->buffer;

f->buffer= av_realloc(f->buffer, new_size);

f->rptr += f->buffer - old;
f->wptr += f->buffer - old;

if(f->wptr < f->rptr){
memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
f->rptr += new_size - old_size;
}
f->end= f->buffer + new_size;
}
}

void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size)
{
int len;

while (size > 0) {
len = FFMIN(f->end - f->wptr, size);
memcpy(f->wptr, buf, len);
f->wptr += len;
if (f->wptr >= f->end)
f->wptr = f->buffer;
buf += len;
size -= len;
}
}


/* get data from the fifo (return -1 if not enough data) */
int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest)
{
int len;
int size = f->wptr - f->rptr;
if (size < 0)
size += f->end - f->buffer;

if (size < buf_size)
return -1;
while (buf_size > 0) {
len = FFMIN(f->end - f->rptr, buf_size);
func(dest, f->rptr, len);
f->rptr += len;
if (f->rptr >= f->end)
f->rptr = f->buffer;
buf_size -= len;
}
return 0;
}

/* discard data from the fifo */
void av_fifo_drain(AVFifoBuffer *f, int size)
{
f->rptr += size;
if (f->rptr >= f->end)
f->rptr -= f->end - f->buffer;
}

+ 25
- 0
libavutil/fifo.h View File

@@ -0,0 +1,25 @@
#ifndef FIFO_H
#define FIFO_H

typedef struct AVFifoBuffer {
uint8_t *buffer;
uint8_t *rptr, *wptr, *end;
} AVFifoBuffer;

int av_fifo_init(AVFifoBuffer *f, int size);
void av_fifo_free(AVFifoBuffer *f);
int av_fifo_size(AVFifoBuffer *f);
int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
void av_fifo_drain(AVFifoBuffer *f, int size);

static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
{
uint8_t *ptr = f->rptr + offs;
if (ptr >= f->end)
ptr -= f->end - f->buffer;
return *ptr;
}
#endif /* FIFO_H */

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