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avcodec: add AV_CODEC_FLAG_DROPCHANGED to flags 

Discard decoded frames which differ from first decoded frame in stream.
This commit is contained in:
Gyan Doshi 2019-04-14 22:12:25 +05:30
parent d93e44332f
commit 3153a6502a
6 changed files with 66 additions and 2 deletions
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2
doc/codecs.texi
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@ -55,6 +55,8 @@ Do not draw edges.
@item psnr
Set error[?] variables during encoding.
@item truncated
@item drop_changed
Don't output frames whose parameters differ from first decoded frame in stream.
@item ildct
Use interlaced DCT.

8
libavcodec/avcodec.h
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@ -859,6 +859,11 @@ typedef struct RcOverride{
* Use qpel MC.
*/
#define AV_CODEC_FLAG_QPEL (1 << 4)
/**
* Don't output frames whose parameters differ from first
* decoded frame in stream.
*/
#define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
/**
* Use internal 2pass ratecontrol in first pass mode.
*/
@ -4918,6 +4923,9 @@ int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
* AVERROR_EOF: the decoder has been fully flushed, and there will be
* no more output frames
* AVERROR(EINVAL): codec not opened, or it is an encoder
* AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
* with respect to first decoded frame. Applicable
* when flag AV_CODEC_FLAG_DROPCHANGED is set.
* other negative values: legitimate decoding errors
*/
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);

47
libavcodec/decode.c
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@ -740,7 +740,7 @@ static int apply_cropping(AVCodecContext *avctx, AVFrame *frame)
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
int ret;
int ret, changed;
av_frame_unref(frame);
@ -765,6 +765,51 @@ int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *fr
avctx->frame_number++;
if (avctx->flags & AV_CODEC_FLAG_DROPCHANGED) {
if (avctx->frame_number == 1) {
avci->initial_format = frame->format;
switch(avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
avci->initial_width = frame->width;
avci->initial_height = frame->height;
break;
case AVMEDIA_TYPE_AUDIO:
avci->initial_sample_rate = frame->sample_rate ? frame->sample_rate :
avctx->sample_rate;
avci->initial_channels = frame->channels;
avci->initial_channel_layout = frame->channel_layout;
break;
}
}
if (avctx->frame_number > 1) {
changed = avci->initial_format != frame->format;
switch(avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
changed |= avci->initial_width != frame->width ||
avci->initial_height != frame->height;
break;
case AVMEDIA_TYPE_AUDIO:
changed |= avci->initial_sample_rate != frame->sample_rate ||
avci->initial_sample_rate != avctx->sample_rate ||
avci->initial_channels != frame->channels ||
avci->initial_channel_layout != frame->channel_layout;
break;
}
if (changed) {
avci->changed_frames_dropped++;
av_log(avctx, AV_LOG_INFO, "dropped changed frame #%d pts %"PRId64
" drop count: %d \n",
avctx->frame_number, frame->pts,
avci->changed_frames_dropped);
av_frame_unref(frame);
return AVERROR_INPUT_CHANGED;
}
}
}
return 0;
}

8
libavcodec/internal.h
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@ -218,6 +218,14 @@ typedef struct AVCodecInternal {
/* to prevent infinite loop on errors when draining */
int nb_draining_errors;
/* used when avctx flag AV_CODEC_FLAG_DROPCHANGED is set */
int changed_frames_dropped;
int initial_format;
int initial_width, initial_height;
int initial_sample_rate;
int initial_channels;
uint64_t initial_channel_layout;
} AVCodecInternal;
struct AVCodecDefault {

1
libavcodec/options_table.h
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@ -67,6 +67,7 @@ static const AVOption avcodec_options[] = {
{"ilme", "interlaced motion estimation", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_INTERLACED_ME }, INT_MIN, INT_MAX, V|E, "flags"},
{"cgop", "closed GOP", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_CLOSED_GOP }, INT_MIN, INT_MAX, V|E, "flags"},
{"output_corrupt", "Output even potentially corrupted frames", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_OUTPUT_CORRUPT }, INT_MIN, INT_MAX, V|D, "flags"},
{"drop_changed", "Drop frames whose parameters differ from first decoded frame", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_DROPCHANGED }, INT_MIN, INT_MAX, A|V|D, "flags"},
{"flags2", NULL, OFFSET(flags2), AV_OPT_TYPE_FLAGS, {.i64 = DEFAULT}, 0, UINT_MAX, V|A|E|D, "flags2"},
{"fast", "allow non-spec-compliant speedup tricks", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG2_FAST }, INT_MIN, INT_MAX, V|E, "flags2"},
{"noout", "skip bitstream encoding", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG2_NO_OUTPUT }, INT_MIN, INT_MAX, V|E, "flags2"},

2
libavcodec/version.h
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@ -28,7 +28,7 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 58
#define LIBAVCODEC_VERSION_MINOR 51
#define LIBAVCODEC_VERSION_MINOR 52
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \