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/* |
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* MLP parser |
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* Copyright (c) 2007 Ian Caulfield |
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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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* MLP parser |
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*/ |
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#include <stdint.h> |
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#include "libavutil/internal.h" |
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#include "get_bits.h" |
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#include "parser.h" |
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#include "mlp_parse.h" |
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#include "mlp.h" |
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typedef struct MLPParseContext |
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{ |
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ParseContext pc; |
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int bytes_left; |
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int in_sync; |
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int num_substreams; |
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} MLPParseContext; |
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static av_cold int mlp_init(AVCodecParserContext *s) |
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{ |
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ff_mlp_init_crc(); |
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return 0; |
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} |
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static int mlp_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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const uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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MLPParseContext *mp = s->priv_data; |
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int sync_present; |
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uint8_t parity_bits; |
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int next; |
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int ret; |
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int i, p = 0; |
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s->key_frame = 0; |
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*poutbuf_size = 0; |
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*poutbuf = NULL; |
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✓✓ |
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if (buf_size == 0) |
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return 0; |
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✗✓ |
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
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next = buf_size; |
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} else { |
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✓✓ |
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if (!mp->in_sync) { |
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// Not in sync - find a major sync header |
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✓✓ |
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for (i = 0; i < buf_size; i++) { |
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mp->pc.state = (mp->pc.state << 8) | buf[i]; |
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✓✓ |
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if ((mp->pc.state & 0xfffffffe) == 0xf8726fba && |
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// ignore if we do not have the data for the start of header |
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✓✗ |
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mp->pc.index + i >= 7) { |
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mp->in_sync = 1; |
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mp->bytes_left = 0; |
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break; |
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} |
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} |
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✓✓ |
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if (!mp->in_sync) { |
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✗✓ |
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if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1) |
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av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n"); |
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return buf_size; |
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} |
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✗✓ |
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if ((ret = ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size)) < 0) { |
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av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n"); |
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return ret; |
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} |
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return i - 7; |
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} |
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✓✓ |
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if (mp->bytes_left == 0) { |
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// Find length of this packet |
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/* Copy overread bytes from last frame into buffer. */ |
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✗✓ |
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for(; mp->pc.overread>0; mp->pc.overread--) { |
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mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++]; |
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} |
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✗✓ |
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if (mp->pc.index + buf_size < 2) { |
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if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1) |
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av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n"); |
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return buf_size; |
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} |
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✗✓ |
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mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8) |
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✗✓ |
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| (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]); |
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mp->bytes_left = (mp->bytes_left & 0xfff) * 2; |
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✗✓ |
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if (mp->bytes_left <= 0) { // prevent infinite loop |
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goto lost_sync; |
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} |
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mp->bytes_left -= mp->pc.index; |
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} |
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✓✓ |
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next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left; |
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✓✓ |
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if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) { |
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mp->bytes_left -= buf_size; |
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return buf_size; |
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} |
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mp->bytes_left = 0; |
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} |
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✓✗✓✓
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sync_present = buf_size >= 8 && (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba; |
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✓✓ |
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if (!sync_present) { |
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/* The first nibble of a frame is a parity check of the 4-byte |
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* access unit header and all the 2- or 4-byte substream headers. */ |
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// Only check when this isn't a sync frame - syncs have a checksum. |
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s->key_frame = 0; |
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parity_bits = 0; |
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✓✓ |
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for (i = -1; i < mp->num_substreams; i++) { |
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parity_bits ^= buf[p++]; |
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parity_bits ^= buf[p++]; |
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✓✓✓✓
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if (i < 0 || buf[p-2] & 0x80) { |
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parity_bits ^= buf[p++]; |
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parity_bits ^= buf[p++]; |
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} |
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} |
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✗✓ |
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if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) { |
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av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n"); |
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goto lost_sync; |
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} |
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} else { |
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GetBitContext gb; |
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MLPHeaderInfo mh; |
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init_get_bits(&gb, buf + 4, (buf_size - 4) << 3); |
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✗✓ |
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if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0) |
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goto lost_sync; |
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s->key_frame = 1; |
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avctx->bits_per_raw_sample = mh.group1_bits; |
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✓✓ |
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if (avctx->bits_per_raw_sample > 16) |
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avctx->sample_fmt = AV_SAMPLE_FMT_S32; |
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else |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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avctx->sample_rate = mh.group1_samplerate; |
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avctx->frame_size = |
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s->duration = mh.access_unit_size; |
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✓✓✗✓
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if(!avctx->channels || !avctx->channel_layout) { |
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✓✓ |
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if (mh.stream_type == 0xbb) { |
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/* MLP stream */ |
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avctx->channels = mh.channels_mlp; |
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avctx->channel_layout = mh.channel_layout_mlp; |
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} else { /* mh.stream_type == 0xba */ |
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/* TrueHD stream */ |
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✗✓ |
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if (!mh.channels_thd_stream2) { |
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avctx->channels = mh.channels_thd_stream1; |
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avctx->channel_layout = mh.channel_layout_thd_stream1; |
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} else { |
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avctx->channels = mh.channels_thd_stream2; |
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avctx->channel_layout = mh.channel_layout_thd_stream2; |
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} |
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} |
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} |
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✗✓ |
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if (!mh.is_vbr) /* Stream is CBR */ |
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avctx->bit_rate = mh.peak_bitrate; |
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mp->num_substreams = mh.num_substreams; |
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} |
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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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return next; |
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lost_sync: |
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mp->in_sync = 0; |
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return 1; |
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} |
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AVCodecParser ff_mlp_parser = { |
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.codec_ids = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD }, |
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.priv_data_size = sizeof(MLPParseContext), |
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.parser_init = mlp_init, |
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.parser_parse = mlp_parse, |
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.parser_close = ff_parse_close, |
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}; |