diff options
Diffstat (limited to 'ffmpeg/libavcodec/mlp_parser.c')
| -rw-r--r-- | ffmpeg/libavcodec/mlp_parser.c | 403 |
1 files changed, 0 insertions, 403 deletions
diff --git a/ffmpeg/libavcodec/mlp_parser.c b/ffmpeg/libavcodec/mlp_parser.c deleted file mode 100644 index fcd1168..0000000 --- a/ffmpeg/libavcodec/mlp_parser.c +++ /dev/null @@ -1,403 +0,0 @@ -/* - * MLP parser - * Copyright (c) 2007 Ian Caulfield - * - * This file is part of FFmpeg. - * - * FFmpeg 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, - * 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 - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * MLP parser - */ - -#include <stdint.h> - -#include "libavutil/channel_layout.h" -#include "libavutil/crc.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, - 0, 0, 0, 0, 0, 0, 0, 0, -}; - -static const uint8_t mlp_channels[32] = { - 1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4, - 5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -}; - -const uint64_t ff_mlp_layout[32] = { - AV_CH_LAYOUT_MONO, - AV_CH_LAYOUT_STEREO, - AV_CH_LAYOUT_2_1, - AV_CH_LAYOUT_QUAD, - AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_SURROUND, - AV_CH_LAYOUT_4POINT0, - AV_CH_LAYOUT_5POINT0_BACK, - AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_5POINT1_BACK, - AV_CH_LAYOUT_4POINT0, - AV_CH_LAYOUT_5POINT0_BACK, - AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_5POINT1_BACK, - AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, - AV_CH_LAYOUT_5POINT0_BACK, - AV_CH_LAYOUT_5POINT1_BACK, - 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) - return 0; - - return (in & 8 ? 44100 : 48000) << (in & 7) ; -} - -static int truehd_channels(int chanmap) -{ - int channels = 0, i; - - for (i = 0; i < 13; i++) - channels += thd_chancount[i] * ((chanmap >> i) & 1); - - return channels; -} - -uint64_t ff_truehd_layout(int chanmap) -{ - int i; - uint64_t layout = 0; - - for (i = 0; i < 13; i++) - layout |= thd_layout[i] * ((chanmap >> i) & 1); - - return layout; -} - -/** Read a major sync info header - contains high level information about - * the stream - sample rate, channel arrangement etc. Most of this - * information is not actually necessary for decoding, only for playback. - * gb must be a freshly initialized GetBitContext with no bits read. - */ - -int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) -{ - int ratebits, channel_arrangement; - uint16_t checksum; - - av_assert1(get_bits_count(gb) == 0); - - if (gb->size_in_bits < 28 << 3) { - av_log(log, AV_LOG_ERROR, "packet too short, unable to read major sync\n"); - return -1; - } - - 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 AVERROR_INVALIDDATA; - } - - if (get_bits_long(gb, 24) != 0xf8726f) /* Sync words */ - return AVERROR_INVALIDDATA; - - mh->stream_type = get_bits(gb, 8); - - if (mh->stream_type == 0xbb) { - mh->group1_bits = mlp_quants[get_bits(gb, 4)]; - mh->group2_bits = mlp_quants[get_bits(gb, 4)]; - - ratebits = get_bits(gb, 4); - mh->group1_samplerate = mlp_samplerate(ratebits); - mh->group2_samplerate = mlp_samplerate(get_bits(gb, 4)); - - skip_bits(gb, 11); - - mh->channel_arrangement= - channel_arrangement = get_bits(gb, 5); - mh->channels_mlp = mlp_channels[channel_arrangement]; - mh->channel_layout_mlp = ff_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; - - ratebits = get_bits(gb, 4); - mh->group1_samplerate = mlp_samplerate(ratebits); - mh->group2_samplerate = 0; - - skip_bits(gb, 8); - - mh->channel_arrangement= - channel_arrangement = get_bits(gb, 5); - mh->channels_thd_stream1 = truehd_channels(channel_arrangement); - mh->channel_layout_thd_stream1 = ff_truehd_layout(channel_arrangement); - - skip_bits(gb, 2); - - channel_arrangement = get_bits(gb, 13); - mh->channels_thd_stream2 = truehd_channels(channel_arrangement); - mh->channel_layout_thd_stream2 = ff_truehd_layout(channel_arrangement); - } else - return AVERROR_INVALIDDATA; - - mh->access_unit_size = 40 << (ratebits & 7); - mh->access_unit_size_pow2 = 64 << (ratebits & 7); - - skip_bits_long(gb, 48); - - mh->is_vbr = get_bits1(gb); - - mh->peak_bitrate = (get_bits(gb, 15) * mh->group1_samplerate + 8) >> 4; - - mh->num_substreams = get_bits(gb, 4); - - skip_bits_long(gb, 4 + 11 * 8); - - return 0; -} - -typedef struct MLPParseContext -{ - ParseContext pc; - - int bytes_left; - - int in_sync; - - 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, - const uint8_t *buf, int buf_size) -{ - MLPParseContext *mp = s->priv_data; - int sync_present; - uint8_t parity_bits; - int next; - int i, p = 0; - - *poutbuf_size = 0; - if (buf_size == 0) - return 0; - - if (!mp->in_sync) { - // Not in sync - find a major sync header - - for (i = 0; i < buf_size; i++) { - mp->pc.state = (mp->pc.state << 8) | buf[i]; - 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; - } - } - - if (!mp->in_sync) { - if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1) - av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n"); - return buf_size; - } - - ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size); - - return i - 7; - } - - if (mp->bytes_left == 0) { - // Find length of this packet - - /* Copy overread bytes from last frame into buffer. */ - for(; mp->pc.overread>0; mp->pc.overread--) { - mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++]; - } - - if (mp->pc.index + buf_size < 2) { - if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1) - av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n"); - return buf_size; - } - - mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8) - | (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]); - mp->bytes_left = (mp->bytes_left & 0xfff) * 2; - if (mp->bytes_left <= 0) { // prevent infinite loop - goto lost_sync; - } - mp->bytes_left -= mp->pc.index; - } - - next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left; - - if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) { - mp->bytes_left -= buf_size; - return buf_size; - } - - mp->bytes_left = 0; - - sync_present = (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba; - - if (!sync_present) { - /* The first nibble of a frame is a parity check of the 4-byte - * access unit header and all the 2- or 4-byte substream headers. */ - // Only check when this isn't a sync frame - syncs have a checksum. - - parity_bits = 0; - for (i = -1; i < mp->num_substreams; i++) { - parity_bits ^= buf[p++]; - parity_bits ^= buf[p++]; - - if (i < 0 || buf[p-2] & 0x80) { - parity_bits ^= buf[p++]; - parity_bits ^= buf[p++]; - } - } - - if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) { - av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n"); - goto lost_sync; - } - } else { - GetBitContext gb; - MLPHeaderInfo mh; - - init_get_bits(&gb, buf + 4, (buf_size - 4) << 3); - if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0) - goto lost_sync; - - 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; - s->duration = mh.access_unit_size; - - if(!avctx->channels || !avctx->channel_layout) { - if (mh.stream_type == 0xbb) { - /* MLP stream */ -#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; -FF_ENABLE_DEPRECATION_WARNINGS - } else -#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 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; -FF_ENABLE_DEPRECATION_WARNINGS - } else -#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 */ - avctx->bit_rate = mh.peak_bitrate; - - mp->num_substreams = mh.num_substreams; - } - - *poutbuf = buf; - *poutbuf_size = buf_size; - - return next; - -lost_sync: - mp->in_sync = 0; - return 1; -} - -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, -}; |