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/* |
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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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/** |
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* @file |
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* This bitstream filter splits VP9 superframes into packets containing |
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* just one frame. |
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*/ |
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#include <stddef.h> |
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#include "bsf.h" |
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#include "bsf_internal.h" |
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#include "bytestream.h" |
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#include "get_bits.h" |
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typedef struct VP9SFSplitContext { |
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AVPacket *buffer_pkt; |
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int nb_frames; |
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int next_frame; |
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size_t next_frame_offset; |
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int sizes[8]; |
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} VP9SFSplitContext; |
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static int vp9_superframe_split_filter(AVBSFContext *ctx, AVPacket *out) |
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{ |
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VP9SFSplitContext *s = ctx->priv_data; |
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AVPacket *in; |
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int i, j, ret, marker; |
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int is_superframe = !!s->buffer_pkt->data; |
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✓✓ |
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if (!s->buffer_pkt->data) { |
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ret = ff_bsf_get_packet_ref(ctx, s->buffer_pkt); |
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✓✓ |
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if (ret < 0) |
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return ret; |
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in = s->buffer_pkt; |
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marker = in->data[in->size - 1]; |
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✓✓ |
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if ((marker & 0xe0) == 0xc0) { |
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int length_size = 1 + ((marker >> 3) & 0x3); |
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int nb_frames = 1 + (marker & 0x7); |
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int idx_size = 2 + nb_frames * length_size; |
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✓✗✓✗
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if (in->size >= idx_size && in->data[in->size - idx_size] == marker) { |
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GetByteContext bc; |
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int64_t total_size = 0; |
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bytestream2_init(&bc, in->data + in->size + 1 - idx_size, |
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nb_frames * length_size); |
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✓✓ |
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for (i = 0; i < nb_frames; i++) { |
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int frame_size = 0; |
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✓✓ |
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for (j = 0; j < length_size; j++) |
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frame_size |= bytestream2_get_byte(&bc) << (j * 8); |
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total_size += frame_size; |
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✓✗✗✓
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if (frame_size < 0 || total_size > in->size - idx_size) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Invalid frame size in a superframe: %d\n", frame_size); |
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ret = AVERROR(EINVAL); |
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goto fail; |
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} |
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s->sizes[i] = frame_size; |
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} |
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s->nb_frames = nb_frames; |
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s->next_frame = 0; |
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s->next_frame_offset = 0; |
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is_superframe = 1; |
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} |
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} |
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} |
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✓✓ |
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if (is_superframe) { |
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GetBitContext gb; |
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int profile, invisible = 0; |
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ret = av_packet_ref(out, s->buffer_pkt); |
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✗✓ |
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if (ret < 0) |
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goto fail; |
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out->data += s->next_frame_offset; |
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out->size = s->sizes[s->next_frame]; |
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s->next_frame_offset += out->size; |
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s->next_frame++; |
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✓✓ |
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if (s->next_frame >= s->nb_frames) |
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av_packet_unref(s->buffer_pkt); |
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ret = init_get_bits8(&gb, out->data, out->size); |
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✗✓ |
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if (ret < 0) |
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goto fail; |
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get_bits(&gb, 2); // frame_marker |
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profile = get_bits1(&gb); |
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profile |= get_bits1(&gb) << 1; |
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✓✓ |
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if (profile == 3) |
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get_bits1(&gb); |
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✓✓ |
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if (!get_bits1(&gb)) { |
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get_bits1(&gb); |
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invisible = !get_bits1(&gb); |
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} |
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✓✓ |
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if (invisible) |
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out->pts = AV_NOPTS_VALUE; |
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} else { |
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av_packet_move_ref(out, s->buffer_pkt); |
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} |
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return 0; |
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fail: |
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if (ret < 0) |
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av_packet_unref(out); |
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av_packet_unref(s->buffer_pkt); |
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return ret; |
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} |
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static int vp9_superframe_split_init(AVBSFContext *ctx) |
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{ |
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VP9SFSplitContext *s = ctx->priv_data; |
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s->buffer_pkt = av_packet_alloc(); |
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✗✓ |
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if (!s->buffer_pkt) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static void vp9_superframe_split_flush(AVBSFContext *ctx) |
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{ |
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VP9SFSplitContext *s = ctx->priv_data; |
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av_packet_unref(s->buffer_pkt); |
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} |
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static void vp9_superframe_split_uninit(AVBSFContext *ctx) |
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{ |
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VP9SFSplitContext *s = ctx->priv_data; |
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av_packet_free(&s->buffer_pkt); |
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} |
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const AVBitStreamFilter ff_vp9_superframe_split_bsf = { |
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.name = "vp9_superframe_split", |
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.priv_data_size = sizeof(VP9SFSplitContext), |
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.init = vp9_superframe_split_init, |
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.flush = vp9_superframe_split_flush, |
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.close = vp9_superframe_split_uninit, |
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.filter = vp9_superframe_split_filter, |
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.codec_ids = (const enum AVCodecID []){ AV_CODEC_ID_VP9, AV_CODEC_ID_NONE }, |
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}; |