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Move AVFrame from lavc to lavu. 

Add AVBuffer-based reference counting API to it.
tags/n2.0
Anton Khirnov 13 years ago
parent
ad0c9f2d5d
commit
7ecc2d403c
4 changed files with 833 additions and 347 deletions
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  1. +1
    -347
      libavcodec/avcodec.h
  2. +2
    -0
      libavutil/Makefile
  3. +401
    -0
      libavutil/frame.c
  4. +429
    -0
      libavutil/frame.h

+ 1
- 347
libavcodec/avcodec.h View File

@@ -32,6 +32,7 @@
#include "libavutil/buffer.h" #include "libavutil/buffer.h"
#include "libavutil/cpu.h" #include "libavutil/cpu.h"
#include "libavutil/dict.h" #include "libavutil/dict.h"
#include "libavutil/frame.h"
#include "libavutil/log.h" #include "libavutil/log.h"
#include "libavutil/pixfmt.h" #include "libavutil/pixfmt.h"
#include "libavutil/rational.h" #include "libavutil/rational.h"
@@ -989,353 +990,6 @@ enum AVSideDataParamChangeFlags {
* @} * @}
*/ */


/**
* This structure describes decoded (raw) audio or video data.
*
* AVFrame must be allocated using avcodec_alloc_frame() and freed with
* avcodec_free_frame(). Note that this allocates only the AVFrame itself. The
* buffers for the data must be managed through other means.
*
* AVFrame is typically allocated once and then reused multiple times to hold
* different data (e.g. a single AVFrame to hold frames received from a
* decoder). In such a case, avcodec_get_frame_defaults() should be used to
* reset the frame to its original clean state before it is reused again.
*
* sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
* to the end with a minor bump.
*/
typedef struct AVFrame {
#define AV_NUM_DATA_POINTERS 8
/**
* pointer to the picture/channel planes.
* This might be different from the first allocated byte
* - encoding: Set by user
* - decoding: set by AVCodecContext.get_buffer()
*/
uint8_t *data[AV_NUM_DATA_POINTERS];

/**
* Size, in bytes, of the data for each picture/channel plane.
*
* For audio, only linesize[0] may be set. For planar audio, each channel
* plane must be the same size.
*
* - encoding: Set by user
* - decoding: set by AVCodecContext.get_buffer()
*/
int linesize[AV_NUM_DATA_POINTERS];

/**
* pointers to the data planes/channels.
*
* For video, this should simply point to data[].
*
* For planar audio, each channel has a separate data pointer, and
* linesize[0] contains the size of each channel buffer.
* For packed audio, there is just one data pointer, and linesize[0]
* contains the total size of the buffer for all channels.
*
* Note: Both data and extended_data will always be set by get_buffer(),
* but for planar audio with more channels that can fit in data,
* extended_data must be used by the decoder in order to access all
* channels.
*
* encoding: set by user
* decoding: set by AVCodecContext.get_buffer()
*/
uint8_t **extended_data;

/**
* width and height of the video frame
* - encoding: unused
* - decoding: Read by user.
*/
int width, height;

/**
* number of audio samples (per channel) described by this frame
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
int nb_samples;

/**
* format of the frame, -1 if unknown or unset
* Values correspond to enum AVPixelFormat for video frames,
* enum AVSampleFormat for audio)
* - encoding: unused
* - decoding: Read by user.
*/
int format;

/**
* 1 -> keyframe, 0-> not
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
int key_frame;

/**
* Picture type of the frame, see ?_TYPE below.
* - encoding: Set by libavcodec. for coded_picture (and set by user for input).
* - decoding: Set by libavcodec.
*/
enum AVPictureType pict_type;

/**
* pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
* This isn't used by libavcodec unless the default get/release_buffer() is used.
* - encoding:
* - decoding:
*/
uint8_t *base[AV_NUM_DATA_POINTERS];

/**
* sample aspect ratio for the video frame, 0/1 if unknown/unspecified
* - encoding: unused
* - decoding: Read by user.
*/
AVRational sample_aspect_ratio;

/**
* presentation timestamp in time_base units (time when frame should be shown to user)
* If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
* - encoding: MUST be set by user.
* - decoding: Set by libavcodec.
*/
int64_t pts;

/**
* pts copied from the AVPacket that was decoded to produce this frame
* - encoding: unused
* - decoding: Read by user.
*/
int64_t pkt_pts;

/**
* dts copied from the AVPacket that triggered returning this frame
* - encoding: unused
* - decoding: Read by user.
*/
int64_t pkt_dts;

/**
* picture number in bitstream order
* - encoding: set by
* - decoding: Set by libavcodec.
*/
int coded_picture_number;
/**
* picture number in display order
* - encoding: set by
* - decoding: Set by libavcodec.
*/
int display_picture_number;

/**
* quality (between 1 (good) and FF_LAMBDA_MAX (bad))
* - encoding: Set by libavcodec. for coded_picture (and set by user for input).
* - decoding: Set by libavcodec.
*/
int quality;

/**
* is this picture used as reference
* The values for this are the same as the MpegEncContext.picture_structure
* variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
* Set to 4 for delayed, non-reference frames.
* - encoding: unused
* - decoding: Set by libavcodec. (before get_buffer() call)).
*/
int reference;

/**
* QP table
* - encoding: unused
* - decoding: Set by libavcodec.
*/
int8_t *qscale_table;
/**
* QP store stride
* - encoding: unused
* - decoding: Set by libavcodec.
*/
int qstride;

/**
*
*/
int qscale_type;

/**
* mbskip_table[mb]>=1 if MB didn't change
* stride= mb_width = (width+15)>>4
* - encoding: unused
* - decoding: Set by libavcodec.
*/
uint8_t *mbskip_table;

/**
* motion vector table
* @code
* example:
* int mv_sample_log2= 4 - motion_subsample_log2;
* int mb_width= (width+15)>>4;
* int mv_stride= (mb_width << mv_sample_log2) + 1;
* motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
* @endcode
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int16_t (*motion_val[2])[2];

/**
* macroblock type table
* mb_type_base + mb_width + 2
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
uint32_t *mb_type;

/**
* DCT coefficients
* - encoding: unused
* - decoding: Set by libavcodec.
*/
short *dct_coeff;

/**
* motion reference frame index
* the order in which these are stored can depend on the codec.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int8_t *ref_index[2];

/**
* for some private data of the user
* - encoding: unused
* - decoding: Set by user.
*/
void *opaque;

/**
* error
* - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
* - decoding: unused
*/
uint64_t error[AV_NUM_DATA_POINTERS];

/**
* type of the buffer (to keep track of who has to deallocate data[*])
* - encoding: Set by the one who allocates it.
* - decoding: Set by the one who allocates it.
* Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
*/
int type;

/**
* When decoding, this signals how much the picture must be delayed.
* extra_delay = repeat_pict / (2*fps)
* - encoding: unused
* - decoding: Set by libavcodec.
*/
int repeat_pict;

/**
* The content of the picture is interlaced.
* - encoding: Set by user.
* - decoding: Set by libavcodec. (default 0)
*/
int interlaced_frame;

/**
* If the content is interlaced, is top field displayed first.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int top_field_first;

/**
* Tell user application that palette has changed from previous frame.
* - encoding: ??? (no palette-enabled encoder yet)
* - decoding: Set by libavcodec. (default 0).
*/
int palette_has_changed;

/**
* codec suggestion on buffer type if != 0
* - encoding: unused
* - decoding: Set by libavcodec. (before get_buffer() call)).
*/
int buffer_hints;

/**
* Pan scan.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
AVPanScan *pan_scan;

/**
* reordered opaque 64bit (generally an integer or a double precision float
* PTS but can be anything).
* The user sets AVCodecContext.reordered_opaque to represent the input at
* that time,
* the decoder reorders values as needed and sets AVFrame.reordered_opaque
* to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
* @deprecated in favor of pkt_pts
* - encoding: unused
* - decoding: Read by user.
*/
int64_t reordered_opaque;

#if FF_API_AVFRAME_LAVC
/**
* @deprecated this field is unused
*/
attribute_deprecated void *hwaccel_picture_private;
#endif

/**
* the AVCodecContext which ff_thread_get_buffer() was last called on
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
struct AVCodecContext *owner;

/**
* used by multithreading to store frame-specific info
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
void *thread_opaque;

/**
* log2 of the size of the block which a single vector in motion_val represents:
* (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
* - encoding: unused
* - decoding: Set by libavcodec.
*/
uint8_t motion_subsample_log2;

/**
* Sample rate of the audio data.
*
* - encoding: unused
* - decoding: set by get_buffer()
*/
int sample_rate;

/**
* Channel layout of the audio data.
*
* - encoding: unused
* - decoding: set by get_buffer()
*/
uint64_t channel_layout;
} AVFrame;

struct AVCodecInternal; struct AVCodecInternal;


enum AVFieldOrder { enum AVFieldOrder {


+ 2
- 0
libavutil/Makefile View File

@@ -20,6 +20,7 @@ HEADERS = adler32.h \
eval.h \ eval.h \
fifo.h \ fifo.h \
file.h \ file.h \
frame.h \
hmac.h \ hmac.h \
imgutils.h \ imgutils.h \
intfloat.h \ intfloat.h \
@@ -70,6 +71,7 @@ OBJS = adler32.o \
fifo.o \ fifo.o \
file.o \ file.o \
float_dsp.o \ float_dsp.o \
frame.o \
hmac.o \ hmac.o \
imgutils.o \ imgutils.o \
intfloat_readwrite.o \ intfloat_readwrite.o \


+ 401
- 0
libavutil/frame.c View File

@@ -0,0 +1,401 @@
/*
*
* 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
*/

#include "audioconvert.h"
#include "buffer.h"
#include "common.h"
#include "frame.h"
#include "imgutils.h"
#include "mem.h"
#include "samplefmt.h"

static void get_frame_defaults(AVFrame *frame)
{
if (frame->extended_data != frame->data)
av_freep(&frame->extended_data);

memset(frame, 0, sizeof(*frame));

frame->pts = AV_NOPTS_VALUE;
frame->key_frame = 1;
frame->sample_aspect_ratio = (AVRational){ 0, 1 };
frame->format = -1; /* unknown */
frame->extended_data = frame->data;
}

AVFrame *av_frame_alloc(void)
{
AVFrame *frame = av_mallocz(sizeof(*frame));

if (!frame)
return NULL;

get_frame_defaults(frame);

return frame;
}

void av_frame_free(AVFrame **frame)
{
if (!frame || !*frame)
return;

av_frame_unref(*frame);
av_freep(frame);
}

static int get_video_buffer(AVFrame *frame, int align)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
int ret, i;

if (!desc)
return AVERROR(EINVAL);

if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
return ret;

if (!frame->linesize[0]) {
ret = av_image_fill_linesizes(frame->linesize, frame->format,
frame->width);
if (ret < 0)
return ret;

for (i = 0; i < 4 && frame->linesize[i]; i++)
frame->linesize[i] = FFALIGN(frame->linesize[i], align);
}

for (i = 0; i < 4 && frame->linesize[i]; i++) {
int h = frame->height;
if (i == 1 || i == 2)
h = -((-h) >> desc->log2_chroma_h);

frame->buf[i] = av_buffer_alloc(frame->linesize[i] * h);
if (!frame->buf[i])
goto fail;

frame->data[i] = frame->buf[i]->data;
}
if (desc->flags & PIX_FMT_PAL || desc->flags & PIX_FMT_PSEUDOPAL) {
av_buffer_unref(&frame->buf[1]);
frame->buf[1] = av_buffer_alloc(1024);
if (!frame->buf[1])
goto fail;
frame->data[1] = frame->buf[1]->data;
}

frame->extended_data = frame->data;

return 0;
fail:
av_frame_unref(frame);
return AVERROR(ENOMEM);
}

static int get_audio_buffer(AVFrame *frame, int align)
{
int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
int planar = av_sample_fmt_is_planar(frame->format);
int planes = planar ? channels : 1;
int ret, i;

if (!frame->linesize[0]) {
ret = av_samples_get_buffer_size(&frame->linesize[0], channels,
frame->nb_samples, frame->format,
align);
if (ret < 0)
return ret;
}

if (planes > AV_NUM_DATA_POINTERS) {
frame->extended_data = av_mallocz(planes *
sizeof(*frame->extended_data));
frame->extended_buf = av_mallocz((planes - AV_NUM_DATA_POINTERS) *
sizeof(*frame->extended_buf));
if (!frame->extended_data || !frame->extended_buf) {
av_freep(&frame->extended_data);
av_freep(&frame->extended_buf);
return AVERROR(ENOMEM);
}
frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
} else
frame->extended_data = frame->data;

for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
frame->buf[i] = av_buffer_alloc(frame->linesize[0]);
if (!frame->buf[i]) {
av_frame_unref(frame);
return AVERROR(ENOMEM);
}
frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
}
for (i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
frame->extended_buf[i] = av_buffer_alloc(frame->linesize[0]);
if (!frame->extended_buf[i]) {
av_frame_unref(frame);
return AVERROR(ENOMEM);
}
frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
}
return 0;

}

int av_frame_get_buffer(AVFrame *frame, int align)
{
if (frame->format < 0)
return AVERROR(EINVAL);

if (frame->width > 0 && frame->height > 0)
return get_video_buffer(frame, align);
else if (frame->nb_samples > 0 && frame->channel_layout)
return get_audio_buffer(frame, align);

return AVERROR(EINVAL);
}

int av_frame_ref(AVFrame *dst, AVFrame *src)
{
int i, ret = 0;

dst->format = src->format;
dst->width = src->width;
dst->height = src->height;
dst->channel_layout = src->channel_layout;
dst->nb_samples = src->nb_samples;

ret = av_frame_copy_props(dst, src);
if (ret < 0)
return ret;

/* duplicate the frame data if it's not refcounted */
if (!src->buf[0]) {
ret = av_frame_get_buffer(dst, 32);
if (ret < 0)
return ret;

if (src->nb_samples) {
int ch = av_get_channel_layout_nb_channels(src->channel_layout);
av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
dst->nb_samples, ch, dst->format);
} else {
av_image_copy(dst->data, dst->linesize, src->data, src->linesize,
dst->format, dst->width, dst->height);
}
return 0;
}

/* ref the buffers */
for (i = 0; i < FF_ARRAY_ELEMS(src->buf) && src->buf[i]; i++) {
dst->buf[i] = av_buffer_ref(src->buf[i]);
if (!dst->buf[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}

if (src->extended_buf) {
dst->extended_buf = av_mallocz(sizeof(*dst->extended_buf) *
src->nb_extended_buf);
if (!dst->extended_buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
dst->nb_extended_buf = src->nb_extended_buf;

for (i = 0; i < src->nb_extended_buf; i++) {
dst->extended_buf[i] = av_buffer_ref(src->extended_buf[i]);
if (!dst->extended_buf[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
}

/* duplicate extended data */
if (src->extended_data != src->data) {
int ch = av_get_channel_layout_nb_channels(src->channel_layout);

if (!ch) {
ret = AVERROR(EINVAL);
goto fail;
}

dst->extended_data = av_malloc(sizeof(*dst->extended_data) * ch);
if (!dst->extended_data) {
ret = AVERROR(ENOMEM);
goto fail;
}
memcpy(dst->extended_data, src->extended_data, sizeof(*src->extended_data) * ch);
} else
dst->extended_data = dst->data;

memcpy(dst->data, src->data, sizeof(src->data));
memcpy(dst->linesize, src->linesize, sizeof(src->linesize));

return 0;

fail:
av_frame_unref(dst);
return ret;
}

AVFrame *av_frame_clone(AVFrame *src)
{
AVFrame *ret = av_frame_alloc();

if (!ret)
return NULL;

if (av_frame_ref(ret, src) < 0)
av_frame_free(&ret);

return ret;
}

void av_frame_unref(AVFrame *frame)
{
int i;

for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
av_buffer_unref(&frame->buf[i]);
for (i = 0; i < frame->nb_extended_buf; i++)
av_buffer_unref(&frame->extended_buf[i]);
av_freep(&frame->extended_buf);
get_frame_defaults(frame);
}

void av_frame_move_ref(AVFrame *dst, AVFrame *src)
{
*dst = *src;
if (src->extended_data == src->data)
dst->extended_data = dst->data;
memset(src, 0, sizeof(*src));
get_frame_defaults(src);
}

int av_frame_is_writable(AVFrame *frame)
{
int i, ret = 1;

/* assume non-refcounted frames are not writable */
if (!frame->buf[0])
return 0;

for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++)
ret &= !!av_buffer_is_writable(frame->buf[i]);
for (i = 0; i < frame->nb_extended_buf; i++)
ret &= !!av_buffer_is_writable(frame->extended_buf[i]);

return ret;
}

int av_frame_make_writable(AVFrame *frame)
{
AVFrame tmp;
int ret;

if (!frame->buf[0])
return AVERROR(EINVAL);

if (av_frame_is_writable(frame))
return 0;

memset(&tmp, 0, sizeof(tmp));
tmp.format = frame->format;
tmp.width = frame->width;
tmp.height = frame->height;
tmp.channel_layout = frame->channel_layout;
tmp.nb_samples = frame->nb_samples;
ret = av_frame_get_buffer(&tmp, 32);
if (ret < 0)
return ret;

if (tmp.nb_samples) {
int ch = av_get_channel_layout_nb_channels(tmp.channel_layout);
av_samples_copy(tmp.extended_data, frame->extended_data, 0, 0,
frame->nb_samples, ch, frame->format);
} else {
av_image_copy(tmp.data, tmp.linesize, frame->data, frame->linesize,
frame->format, frame->width, frame->height);
}

ret = av_frame_copy_props(&tmp, frame);
if (ret < 0) {
av_frame_unref(&tmp);
return ret;
}

av_frame_unref(frame);

*frame = tmp;
if (tmp.data == tmp.extended_data)
frame->extended_data = frame->data;

return 0;
}

int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
{
dst->key_frame = src->key_frame;
dst->pict_type = src->pict_type;
dst->sample_aspect_ratio = src->sample_aspect_ratio;
dst->pts = src->pts;
dst->interlaced_frame = src->interlaced_frame;
dst->top_field_first = src->top_field_first;
dst->sample_rate = src->sample_rate;
dst->opaque = src->opaque;
dst->pkt_pts = src->pkt_pts;
dst->pkt_dts = src->pkt_dts;
dst->quality = src->quality;
dst->coded_picture_number = src->coded_picture_number;
dst->display_picture_number = src->display_picture_number;

return 0;
}

AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
{
uint8_t *data;
int planes, i;

if (frame->nb_samples) {
int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
if (!channels)
return NULL;
planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
} else
planes = 4;

if (plane < 0 || plane >= planes || !frame->extended_data[plane])
return NULL;
data = frame->extended_data[plane];

for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++) {
AVBufferRef *buf = frame->buf[i];
if (data >= buf->data && data < buf->data + buf->size)
return buf;
}
for (i = 0; i < frame->nb_extended_buf; i++) {
AVBufferRef *buf = frame->extended_buf[i];
if (data >= buf->data && data < buf->data + buf->size)
return buf;
}
return NULL;
}

+ 429
- 0
libavutil/frame.h View File

@@ -0,0 +1,429 @@
/*
*
* 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 AVUTIL_FRAME_H
#define AVUTIL_FRAME_H

#include <stdint.h>

#include "libavcodec/version.h"

#include "avutil.h"
#include "buffer.h"
#include "rational.h"
#include "samplefmt.h"


/**
* This structure describes decoded (raw) audio or video data.
*
* AVFrame must be allocated using av_frame_alloc(). Not that this only
* allocates the AVFrame itself, the buffers for the data must be managed
* through other means (see below).
* AVFrame must be freed with av_frame_free().
*
* AVFrame is typically allocated once and then reused multiple times to hold
* different data (e.g. a single AVFrame to hold frames received from a
* decoder). In such a case, av_frame_unref() will free any references held by
* the frame and reset it to its original clean state before it
* is reused again.
*
* The data described by an AVFrame is usually reference counted through the
* AVBuffer API. The underlying buffer references are stored in AVFrame.buf /
* AVFrame.extended_buf. An AVFrame is considered to be reference counted if at
* least one reference is set, i.e. if AVFrame.buf[0] != NULL. In such a case,
* every single data plane must be contained in one of the buffers in
* AVFrame.buf or AVFrame.extended_buf.
* There may be a single buffer for all the data, or one separate buffer for
* each plane, or anything in between.
*
* sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
* to the end with a minor bump.
*/
typedef struct AVFrame {
#define AV_NUM_DATA_POINTERS 8
/**
* pointer to the picture/channel planes.
* This might be different from the first allocated byte
*/
uint8_t *data[AV_NUM_DATA_POINTERS];

/**
* For video, size in bytes of each picture line.
* For audio, size in bytes of each plane.
*
* For audio, only linesize[0] may be set. For planar audio, each channel
* plane must be the same size.
*/
int linesize[AV_NUM_DATA_POINTERS];

/**
* pointers to the data planes/channels.
*
* For video, this should simply point to data[].
*
* For planar audio, each channel has a separate data pointer, and
* linesize[0] contains the size of each channel buffer.
* For packed audio, there is just one data pointer, and linesize[0]
* contains the total size of the buffer for all channels.
*
* Note: Both data and extended_data should always be set in a valid frame,
* but for planar audio with more channels that can fit in data,
* extended_data must be used in order to access all channels.
*/
uint8_t **extended_data;

/**
* width and height of the video frame
*/
int width, height;

/**
* number of audio samples (per channel) described by this frame
*/
int nb_samples;

/**
* format of the frame, -1 if unknown or unset
* Values correspond to enum AVPixelFormat for video frames,
* enum AVSampleFormat for audio)
*/
int format;

/**
* 1 -> keyframe, 0-> not
*/
int key_frame;

/**
* Picture type of the frame.
*/
enum AVPictureType pict_type;

uint8_t *base[AV_NUM_DATA_POINTERS];

/**
* Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
*/
AVRational sample_aspect_ratio;

/**
* Presentation timestamp in time_base units (time when frame should be shown to user).
*/
int64_t pts;

/**
* PTS copied from the AVPacket that was decoded to produce this frame.
*/
int64_t pkt_pts;

/**
* DTS copied from the AVPacket that triggered returning this frame.
*/
int64_t pkt_dts;

/**
* picture number in bitstream order
*/
int coded_picture_number;
/**
* picture number in display order
*/
int display_picture_number;

/**
* quality (between 1 (good) and FF_LAMBDA_MAX (bad))
*/
int quality;

int reference;

/**
* QP table
*/
int8_t *qscale_table;
/**
* QP store stride
*/
int qstride;

int qscale_type;

/**
* mbskip_table[mb]>=1 if MB didn't change
* stride= mb_width = (width+15)>>4
*/
uint8_t *mbskip_table;

/**
* motion vector table
* @code
* example:
* int mv_sample_log2= 4 - motion_subsample_log2;
* int mb_width= (width+15)>>4;
* int mv_stride= (mb_width << mv_sample_log2) + 1;
* motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
* @endcode
*/
int16_t (*motion_val[2])[2];

/**
* macroblock type table
* mb_type_base + mb_width + 2
*/
uint32_t *mb_type;

/**
* DCT coefficients
*/
short *dct_coeff;

/**
* motion reference frame index
* the order in which these are stored can depend on the codec.
*/
int8_t *ref_index[2];

/**
* for some private data of the user
*/
void *opaque;

/**
* error
*/
uint64_t error[AV_NUM_DATA_POINTERS];

int type;

/**
* When decoding, this signals how much the picture must be delayed.
* extra_delay = repeat_pict / (2*fps)
*/
int repeat_pict;

/**
* The content of the picture is interlaced.
*/
int interlaced_frame;

/**
* If the content is interlaced, is top field displayed first.
*/
int top_field_first;

/**
* Tell user application that palette has changed from previous frame.
*/
int palette_has_changed;

int buffer_hints;

/**
* Pan scan.
*/
struct AVPanScan *pan_scan;

/**
* reordered opaque 64bit (generally an integer or a double precision float
* PTS but can be anything).
* The user sets AVCodecContext.reordered_opaque to represent the input at
* that time,
* the decoder reorders values as needed and sets AVFrame.reordered_opaque
* to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
* @deprecated in favor of pkt_pts
*/
int64_t reordered_opaque;

#if FF_API_AVFRAME_LAVC
/**
* @deprecated this field is unused
*/
attribute_deprecated void *hwaccel_picture_private;
#endif

struct AVCodecContext *owner;
void *thread_opaque;

/**
* log2 of the size of the block which a single vector in motion_val represents:
* (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
*/
uint8_t motion_subsample_log2;

/**
* Sample rate of the audio data.
*/
int sample_rate;

/**
* Channel layout of the audio data.
*/
uint64_t channel_layout;

/**
* AVBuffer references backing the data for this frame. If all elements of
* this array are NULL, then this frame is not reference counted.
*
* There may be at most one AVBuffer per data plane, so for video this array
* always contains all the references. For planar audio with more than
* AV_NUM_DATA_POINTERS channels, there may be more buffers than can fit in
* this array. Then the extra AVBufferRef pointers are stored in the
* extended_buf array.
*/
AVBufferRef *buf[AV_NUM_DATA_POINTERS];

/**
* For planar audio which requires more than AV_NUM_DATA_POINTERS
* AVBufferRef pointers, this array will hold all the references which
* cannot fit into AVFrame.buf.
*
* Note that this is different from AVFrame.extended_data, which always
* contains all the pointers. This array only contains the extra pointers,
* which cannot fit into AVFrame.buf.
*
* This array is always allocated using av_malloc() by whoever constructs
* the frame. It is freed in av_frame_unref().
*/
AVBufferRef **extended_buf;
/**
* Number of elements in extended_buf.
*/
int nb_extended_buf;
} AVFrame;

/**
* Allocate an AVFrame and set its fields to default values. The resulting
* struct must be freed using av_frame_free().
*
* @return An AVFrame filled with default values or NULL on failure.
*
* @note this only allocates the AVFrame itself, not the data buffers. Those
* must be allocated through other means, e.g. with av_frame_get_buffer() or
* manually.
*/
AVFrame *av_frame_alloc(void);

/**
* Free the frame and any dynamically allocated objects in it,
* e.g. extended_data. If the frame is reference counted, it will be
* unreferenced first.
*
* @param frame frame to be freed. The pointer will be set to NULL.
*/
void av_frame_free(AVFrame **frame);

/**
* Setup a new reference to the data described by an given frame.
*
* Copy frame properties from src to dst and create a new reference for each
* AVBufferRef from src.
*
* If src is not reference counted, new buffers are allocated and the data is
* copied.
*
* @return 0 on success, a negative AVERROR on error
*/
int av_frame_ref(AVFrame *dst, AVFrame *src);

/**
* Create a new frame that references the same data as src.
*
* This is a shortcut for av_frame_alloc()+av_frame_ref().
*
* @return newly created AVFrame on success, NULL on error.
*/
AVFrame *av_frame_clone(AVFrame *src);

/**
* Unreference all the buffers referenced by frame and reset the frame fields.
*/
void av_frame_unref(AVFrame *frame);

/**
* Move everythnig contained in src to dst and reset src.
*/
void av_frame_move_ref(AVFrame *dst, AVFrame *src);

/**
* Allocate new buffer(s) for audio or video data.
*
* The following fields must be set on frame before calling this function:
* - format (pixel format for video, sample format for audio)
* - width and height for video
* - nb_samples and channel_layout for audio
*
* This function will fill AVFrame.data and AVFrame.buf arrays and, if
* necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
* For planar formats, one buffer will be allocated for each plane.
*
* @param frame frame in which to store the new buffers.
* @param align required buffer size alignment
*
* @return 0 on success, a negative AVERROR on error.
*/
int av_frame_get_buffer(AVFrame *frame, int align);

/**
* Check if the frame data is writable.
*
* @return A positive value if the frame data is writable (which is true if and
* only if each of the underlying buffers has only one reference, namely the one
* stored in this frame). Return 0 otherwise.
*
* If 1 is returned the answer is valid until av_buffer_ref() is called on any
* of the underlying AVBufferRefs (e.g. through av_frame_ref() or directly).
*
* @see av_frame_make_writable(), av_buffer_is_writable()
*/
int av_frame_is_writable(AVFrame *frame);

/**
* Ensure that the frame data is writable, avoiding data copy if possible.
*
* Do nothing if the frame is writable, allocate new buffers and copy the data
* if it is not.
*
* @return 0 on success, a negative AVERROR on error.
*
* @see av_frame_is_writable(), av_buffer_is_writable(),
* av_buffer_make_writable()
*/
int av_frame_make_writable(AVFrame *frame);

/**
* Copy only "metadata" fields from src to dst.
*
* Metadata for the purpose of this function are those fields that do not affect
* the data layout in the buffers. E.g. pts, sample rate (for audio) or sample
* aspect ratio (for video), but not width/height or channel layout.
*/
int av_frame_copy_props(AVFrame *dst, const AVFrame *src);

/**
* Get the buffer reference a given data plane is stored in.
*
* @param plane index of the data plane of interest in frame->extended_data.
*
* @return the buffer reference that contains the plane or NULL if the input
* frame is not valid.
*/
AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane);

#endif /* AVUTIL_FRAME_H */

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