X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmlp_parser.c;h=8766bd0c1feb1ab92b402e71c8f61c2ae11b8810;hb=0652e024c680420d298cdf3719d0a0c030173fe3;hp=646442bf03e47d0ca0ddc2255235d13048f3ae21;hpb=0e74e1ff3c9aaa49fe9cf7ac688c7f6e738a0394;p=ffmpeg diff --git a/libavcodec/mlp_parser.c b/libavcodec/mlp_parser.c index 646442bf03e..8766bd0c1fe 100644 --- a/libavcodec/mlp_parser.c +++ b/libavcodec/mlp_parser.c @@ -2,34 +2,37 @@ * MLP parser * Copyright (c) 2007 Ian Caulfield * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * FFmpeg is distributed in the hope that it will be useful, + * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file mlp_parser.c + * @file * MLP parser */ #include +#include "libavutil/channel_layout.h" #include "libavutil/crc.h" -#include "bitstream.h" +#include "libavutil/internal.h" +#include "get_bits.h" #include "parser.h" #include "mlp_parser.h" +#include "mlp.h" static const uint8_t mlp_quants[16] = { 16, 20, 24, 0, 0, 0, 0, 0, @@ -41,11 +44,52 @@ static const uint8_t mlp_channels[32] = { 5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; +static const uint64_t mlp_layout[32] = { + AV_CH_LAYOUT_MONO, + AV_CH_LAYOUT_STEREO, + AV_CH_LAYOUT_2_1, + AV_CH_LAYOUT_2_2, + AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_SURROUND, + AV_CH_LAYOUT_4POINT0, + AV_CH_LAYOUT_5POINT0, + AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_5POINT1, + AV_CH_LAYOUT_4POINT0, + AV_CH_LAYOUT_5POINT0, + AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_5POINT1, + AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY, + AV_CH_LAYOUT_5POINT0, + AV_CH_LAYOUT_5POINT1, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + static const uint8_t thd_chancount[13] = { // LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1 }; +static const uint64_t thd_layout[13] = { + AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR + AV_CH_FRONT_CENTER, // C + AV_CH_LOW_FREQUENCY, // LFE + AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs + AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh + AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc + AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs + AV_CH_BACK_CENTER, // Cs + AV_CH_TOP_CENTER, // Ts + AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd + AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw + AV_CH_TOP_FRONT_CENTER, // Cvh + AV_CH_LOW_FREQUENCY_2, // LFE2 +}; + static int mlp_samplerate(int in) { if (in == 0xF) @@ -64,27 +108,15 @@ static int truehd_channels(int chanmap) return channels; } -static int crc_init = 0; -static AVCRC crc_2D[1024]; - -/** MLP uses checksums that seem to be based on the standard CRC algorithm, but - * are not (in implementation terms, the table lookup and XOR are reversed). - * We can implement this behavior using a standard av_crc on all but the - * last element, then XOR that with the last element. - */ - -static uint16_t mlp_checksum16(const uint8_t *buf, unsigned int buf_size) +static uint64_t truehd_layout(int chanmap) { - uint16_t crc; + int i; + uint64_t layout = 0; - if (!crc_init) { - av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D)); - crc_init = 1; - } + for (i = 0; i < 13; i++) + layout |= thd_layout[i] * ((chanmap >> i) & 1); - crc = av_crc(crc_2D, 0, buf, buf_size - 2); - crc ^= AV_RL16(buf + buf_size - 2); - return crc; + return layout; } /** Read a major sync info header - contains high level information about @@ -95,7 +127,7 @@ static uint16_t mlp_checksum16(const uint8_t *buf, unsigned int buf_size) int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) { - int ratebits; + int ratebits, channel_arrangement; uint16_t checksum; assert(get_bits_count(gb) == 0); @@ -105,14 +137,14 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) return -1; } - checksum = mlp_checksum16(gb->buffer, 26); + checksum = ff_mlp_checksum16(gb->buffer, 26); if (checksum != AV_RL16(gb->buffer+26)) { av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n"); - return -1; + return AVERROR_INVALIDDATA; } if (get_bits_long(gb, 24) != 0xf8726f) /* Sync words */ - return -1; + return AVERROR_INVALIDDATA; mh->stream_type = get_bits(gb, 8); @@ -126,7 +158,9 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) skip_bits(gb, 11); - mh->channels_mlp = get_bits(gb, 5); + channel_arrangement = get_bits(gb, 5); + mh->channels_mlp = mlp_channels[channel_arrangement]; + mh->channel_layout_mlp = mlp_layout[channel_arrangement]; } else if (mh->stream_type == 0xba) { mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere? mh->group2_bits = 0; @@ -135,15 +169,22 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) mh->group1_samplerate = mlp_samplerate(ratebits); mh->group2_samplerate = 0; - skip_bits(gb, 8); + skip_bits(gb, 4); - mh->channels_thd_stream1 = get_bits(gb, 5); + mh->channel_modifier_thd_stream0 = get_bits(gb, 2); + mh->channel_modifier_thd_stream1 = get_bits(gb, 2); - skip_bits(gb, 2); + channel_arrangement = get_bits(gb, 5); + mh->channels_thd_stream1 = truehd_channels(channel_arrangement); + mh->channel_layout_thd_stream1 = truehd_layout(channel_arrangement); - mh->channels_thd_stream2 = get_bits(gb, 13); + mh->channel_modifier_thd_stream2 = get_bits(gb, 2); + + channel_arrangement = get_bits(gb, 13); + mh->channels_thd_stream2 = truehd_channels(channel_arrangement); + mh->channel_layout_thd_stream2 = truehd_layout(channel_arrangement); } else - return -1; + return AVERROR_INVALIDDATA; mh->access_unit_size = 40 << (ratebits & 7); mh->access_unit_size_pow2 = 64 << (ratebits & 7); @@ -172,6 +213,12 @@ typedef struct MLPParseContext int num_substreams; } MLPParseContext; +static av_cold int mlp_init(AVCodecParserContext *s) +{ + ff_mlp_init_crc(); + return 0; +} + static int mlp_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, @@ -192,7 +239,9 @@ static int mlp_parse(AVCodecParserContext *s, for (i = 0; i < buf_size; i++) { mp->pc.state = (mp->pc.state << 8) | buf[i]; - if ((mp->pc.state & 0xfffffffe) == 0xf8726fba) { + if ((mp->pc.state & 0xfffffffe) == 0xf8726fba && + // ignore if we do not have the data for the start of header + mp->pc.index + i >= 7) { mp->in_sync = 1; mp->bytes_left = 0; break; @@ -267,23 +316,60 @@ static int mlp_parse(AVCodecParserContext *s, if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0) goto lost_sync; -#ifdef CONFIG_AUDIO_NONSHORT - avctx->bits_per_sample = mh.group1_bits; - if (avctx->bits_per_sample > 16) - avctx->sample_fmt = SAMPLE_FMT_S32; -#endif + avctx->bits_per_raw_sample = mh.group1_bits; + if (avctx->bits_per_raw_sample > 16) + avctx->sample_fmt = AV_SAMPLE_FMT_S32; + else + avctx->sample_fmt = AV_SAMPLE_FMT_S16; avctx->sample_rate = mh.group1_samplerate; - avctx->frame_size = mh.access_unit_size; + s->duration = mh.access_unit_size; if (mh.stream_type == 0xbb) { /* MLP stream */ - avctx->channels = mlp_channels[mh.channels_mlp]; +#if FF_API_REQUEST_CHANNELS +FF_DISABLE_DEPRECATION_WARNINGS + if (avctx->request_channels > 0 && avctx->request_channels <= 2 && + mh.num_substreams > 1) { + avctx->channels = 2; + avctx->channel_layout = AV_CH_LAYOUT_STEREO; + } else +FF_ENABLE_DEPRECATION_WARNINGS +#endif + if (avctx->request_channel_layout == AV_CH_LAYOUT_STEREO && + mh.num_substreams > 1) { + avctx->channels = 2; + avctx->channel_layout = AV_CH_LAYOUT_STEREO; + } else { + avctx->channels = mh.channels_mlp; + avctx->channel_layout = mh.channel_layout_mlp; + } } else { /* mh.stream_type == 0xba */ /* TrueHD stream */ - if (mh.channels_thd_stream2) - avctx->channels = truehd_channels(mh.channels_thd_stream2); - else - avctx->channels = truehd_channels(mh.channels_thd_stream1); +#if FF_API_REQUEST_CHANNELS +FF_DISABLE_DEPRECATION_WARNINGS + if (avctx->request_channels > 0 && avctx->request_channels <= 2 && + mh.num_substreams > 1) { + avctx->channels = 2; + avctx->channel_layout = AV_CH_LAYOUT_STEREO; + } else if (avctx->request_channels > 0 && + avctx->request_channels <= mh.channels_thd_stream1) { + avctx->channels = mh.channels_thd_stream1; + avctx->channel_layout = mh.channel_layout_thd_stream1; + } else +FF_ENABLE_DEPRECATION_WARNINGS +#endif + if (avctx->request_channel_layout == AV_CH_LAYOUT_STEREO && + mh.num_substreams > 1) { + avctx->channels = 2; + avctx->channel_layout = AV_CH_LAYOUT_STEREO; + } else if (avctx->request_channel_layout == mh.channel_layout_thd_stream1 || + !mh.channels_thd_stream2) { + avctx->channels = mh.channels_thd_stream1; + avctx->channel_layout = mh.channel_layout_thd_stream1; + } else { + avctx->channels = mh.channels_thd_stream2; + avctx->channel_layout = mh.channel_layout_thd_stream2; + } } if (!mh.is_vbr) /* Stream is CBR */ @@ -302,10 +388,10 @@ lost_sync: return 1; } -AVCodecParser mlp_parser = { - { CODEC_ID_MLP }, - sizeof(MLPParseContext), - NULL, - mlp_parse, - NULL, +AVCodecParser ff_mlp_parser = { + .codec_ids = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD }, + .priv_data_size = sizeof(MLPParseContext), + .parser_init = mlp_init, + .parser_parse = mlp_parse, + .parser_close = ff_parse_close, };