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lavc: deprecate AV_CODEC_FLAG_DROPCHANGED

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This decoding flag makes decoders drop all frames after a parameter
change, but what exactly constitutes a parameter change is not well
defined and will typically depend on the exact use case.
This functionality then does not belong in libavcodec, but rather in
user code
This commit is contained in:
Anton Khirnov 2023-07-09 14:53:46 +02:00
parent 9557bf26b3
commit f264204de9
7 changed files with 24 additions and 6 deletions
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3
doc/APIchanges
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@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
API changes, most recent first:
2023-07-xx - xxxxxxxxxx - lavc 60 - avcodec.h
Deprecate AV_CODEC_FLAG_DROPCHANGED without replacement.
2023-07-05 - xxxxxxxxxx - lavu 58.14.100 - random_seed.h
Add av_random_bytes()

2
libavcodec/avcodec.c
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@ -456,7 +456,9 @@ av_cold int avcodec_close(AVCodecContext *avctx)
av_bsf_free(&avci->bsf);
#if FF_API_DROPCHANGED
av_channel_layout_uninit(&avci->initial_ch_layout);
#endif
#if CONFIG_LCMS2
ff_icc_context_uninit(&avci->icc);

7
libavcodec/avcodec.h
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@ -226,11 +226,15 @@ typedef struct RcOverride{
* Use qpel MC.
*/
#define AV_CODEC_FLAG_QPEL (1 << 4)
#if FF_API_DROPCHANGED
/**
* Don't output frames whose parameters differ from first
* decoded frame in stream.
*
* @deprecated callers should implement this functionality in their own code
*/
#define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
#endif
/**
* Request the encoder to output reconstructed frames, i.e.\ frames that would
* be produced by decoding the encoded bistream. These frames may be retrieved
@ -2713,9 +2717,6 @@ int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
* no more output frames
* @retval AVERROR(EINVAL) codec not opened, or it is an encoder without the
* @ref AV_CODEC_FLAG_RECON_FRAME flag enabled
* @retval AVERROR_INPUT_CHANGED current decoded frame has changed parameters with
* respect to first decoded frame. Applicable when flag
* AV_CODEC_FLAG_DROPCHANGED is set.
* @retval "other negative error code" legitimate decoding errors
*/
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);

11
libavcodec/decode.c
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@ -773,7 +773,7 @@ fail:
int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
int ret, changed;
int ret;
if (!avcodec_is_open(avctx) || !av_codec_is_decoder(avctx->codec))
return AVERROR(EINVAL);
@ -803,6 +803,7 @@ FF_DISABLE_DEPRECATION_WARNINGS
FF_ENABLE_DEPRECATION_WARNINGS
#endif
#if FF_API_DROPCHANGED
if (avctx->flags & AV_CODEC_FLAG_DROPCHANGED) {
if (avctx->frame_num == 1) {
@ -823,7 +824,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
}
if (avctx->frame_num > 1) {
changed = avci->initial_format != frame->format;
int changed = avci->initial_format != frame->format;
switch(avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
@ -848,6 +849,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
}
}
}
#endif
return 0;
fail:
av_frame_unref(frame);
@ -1773,6 +1775,11 @@ int ff_decode_preinit(AVCodecContext *avctx)
if (ret < 0)
return ret;
#if FF_API_DROPCHANGED
if (avctx->flags & AV_CODEC_FLAG_DROPCHANGED)
av_log(avctx, AV_LOG_WARNING, "The dropchanged flag is deprecated.\n");
#endif
return 0;
}

2
libavcodec/internal.h
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@ -135,12 +135,14 @@ typedef struct AVCodecInternal {
AVFrame *buffer_frame;
int draining_done;
#if FF_API_DROPCHANGED
/* 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;
AVChannelLayout initial_ch_layout;
#endif
#if CONFIG_LCMS2
FFIccContext icc; /* used to read and write embedded ICC profiles */

4
libavcodec/options_table.h
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@ -72,7 +72,9 @@ 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"},
#if FF_API_DROPCHANGED
{"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 | AV_OPT_FLAG_DEPRECATED, "flags"},
#endif
{"flags2", NULL, OFFSET(flags2), AV_OPT_TYPE_FLAGS, {.i64 = DEFAULT}, 0, UINT_MAX, V|A|E|D|S, "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"},

1
libavcodec/version_major.h
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@ -48,6 +48,7 @@
#define FF_API_SLICE_OFFSET (LIBAVCODEC_VERSION_MAJOR < 61)
#define FF_API_SUBFRAMES (LIBAVCODEC_VERSION_MAJOR < 61)
#define FF_API_TICKS_PER_FRAME (LIBAVCODEC_VERSION_MAJOR < 61)
#define FF_API_DROPCHANGED (LIBAVCODEC_VERSION_MAJOR < 61)
// reminder to remove CrystalHD decoders on next major bump
#define FF_CODEC_CRYSTAL_HD (LIBAVCODEC_VERSION_MAJOR < 61)