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259dc4e013
Previously the codec kept an entire copy of the SPS, and restarted the VT decoder session whenever it changed. This fixed decoding errors in [1], as described in9519983c. On further inspection, that sample features an SPS change from High/4.0 to High/3.2 while moving from one scene to another. Yesterday I received [2], which contains minor SPS changes where the profile and level do not change. These occur frequently and are not associated with scene changes. After9519983c, the VT decoder session is recreated unnecessarily when these are encountered causing visual glitches. This commit simplifies the state kept in the VTContext to include just the first three bytes of the SPS, containing the profile and level details. This is populated initially when the VT decoder session is created, and used to detect changes and force a restart. This means minor SPS changes are fed directly into the existing decoder, whereas profile/level changes force the decoder session to be recreated with the new parameters. After this commit, both samples [1] and [2] playback as expected. [1] https://s3.amazonaws.com/tmm1/videotoolbox/spschange.ts [2] https://s3.amazonaws.com/tmm1/videotoolbox/spschange2.ts Signed-off-by: Aman Gupta <aman@tmm1.net>
60 lines
2.3 KiB
C
60 lines
2.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_VT_INTERNAL_H
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#define AVCODEC_VT_INTERNAL_H
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typedef struct VTContext {
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// The current bitstream buffer.
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uint8_t *bitstream;
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// The current size of the bitstream.
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int bitstream_size;
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// The reference size used for fast reallocation.
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int allocated_size;
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// The core video buffer
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CVImageBufferRef frame;
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// Current dummy frames context (depends on exact CVImageBufferRef params).
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struct AVBufferRef *cached_hw_frames_ctx;
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// Non-NULL if the new hwaccel API is used. This is only a separate struct
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// to ease compatibility with the old API.
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struct AVVideotoolboxContext *vt_ctx;
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// Current H264 parameters (used to trigger decoder restart on SPS changes).
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uint8_t sps[3];
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bool reconfig_needed;
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} VTContext;
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int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame);
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int ff_videotoolbox_uninit(AVCodecContext *avctx);
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int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame);
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int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
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const uint8_t *buffer,
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uint32_t size);
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int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
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const uint8_t *buffer,
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uint32_t size);
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CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx);
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CFDataRef ff_videotoolbox_hvcc_extradata_create(AVCodecContext *avctx);
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#endif /* AVCODEC_VT_INTERNAL_H */
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