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215 lines
6.9 KiB
215 lines
6.9 KiB
/* |
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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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#include <stdint.h> |
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#include "libavutil/channel_layout.h" |
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#include "get_bits.h" |
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#include "mlp_parse.h" |
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#include "mlp.h" |
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static const uint8_t mlp_quants[16] = { |
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16, 20, 24, 0, 0, 0, 0, 0, |
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0, 0, 0, 0, 0, 0, 0, 0, |
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}; |
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static const uint8_t mlp_channels[32] = { |
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1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4, |
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5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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}; |
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static const uint64_t mlp_layout[32] = { |
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AV_CH_LAYOUT_MONO, |
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AV_CH_LAYOUT_STEREO, |
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AV_CH_LAYOUT_2_1, |
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AV_CH_LAYOUT_QUAD, |
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AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_SURROUND, |
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AV_CH_LAYOUT_4POINT0, |
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AV_CH_LAYOUT_5POINT0_BACK, |
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AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_5POINT1_BACK, |
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AV_CH_LAYOUT_4POINT0, |
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AV_CH_LAYOUT_5POINT0_BACK, |
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AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_5POINT1_BACK, |
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AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, |
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AV_CH_LAYOUT_5POINT0_BACK, |
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AV_CH_LAYOUT_5POINT1_BACK, |
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
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}; |
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static const uint8_t thd_chancount[13] = { |
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// LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2 |
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2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1 |
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}; |
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static const uint64_t thd_layout[13] = { |
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AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR |
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AV_CH_FRONT_CENTER, // C |
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AV_CH_LOW_FREQUENCY, // LFE |
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AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs |
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AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh |
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AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc |
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AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs |
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AV_CH_BACK_CENTER, // Cs |
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AV_CH_TOP_CENTER, // Ts |
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AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd |
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AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw |
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AV_CH_TOP_FRONT_CENTER, // Cvh |
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AV_CH_LOW_FREQUENCY_2, // LFE2 |
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}; |
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static int mlp_samplerate(int in) |
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{ |
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if (in == 0xF) |
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return 0; |
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return (in & 8 ? 44100 : 48000) << (in & 7) ; |
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} |
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static int truehd_channels(int chanmap) |
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{ |
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int channels = 0, i; |
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for (i = 0; i < 13; i++) |
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channels += thd_chancount[i] * ((chanmap >> i) & 1); |
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return channels; |
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} |
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static uint64_t truehd_layout(int chanmap) |
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{ |
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int i; |
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uint64_t layout = 0; |
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for (i = 0; i < 13; i++) |
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layout |= thd_layout[i] * ((chanmap >> i) & 1); |
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return layout; |
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} |
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static int mlp_get_major_sync_size(const uint8_t * buf, int bufsize) |
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{ |
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int has_extension, extensions = 0; |
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int size = 28; |
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if (bufsize < 28) |
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return -1; |
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if (AV_RB32(buf) == 0xf8726fba) { |
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has_extension = buf[25] & 1; |
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if (has_extension) { |
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extensions = buf[26] >> 4; |
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size += 2 + extensions * 2; |
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} |
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} |
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return size; |
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} |
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/** Read a major sync info header - contains high level information about |
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* the stream - sample rate, channel arrangement etc. Most of this |
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* information is not actually necessary for decoding, only for playback. |
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* gb must be a freshly initialized GetBitContext with no bits read. |
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*/ |
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int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) |
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{ |
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int ratebits, channel_arrangement, header_size; |
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uint16_t checksum; |
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av_assert1(get_bits_count(gb) == 0); |
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header_size = mlp_get_major_sync_size(gb->buffer, gb->size_in_bits >> 3); |
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if (header_size < 0 || gb->size_in_bits < header_size << 3) { |
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av_log(log, AV_LOG_ERROR, "packet too short, unable to read major sync\n"); |
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return -1; |
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} |
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checksum = ff_mlp_checksum16(gb->buffer, header_size - 2); |
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if (checksum != AV_RL16(gb->buffer+header_size-2)) { |
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av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (get_bits_long(gb, 24) != 0xf8726f) /* Sync words */ |
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return AVERROR_INVALIDDATA; |
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mh->stream_type = get_bits(gb, 8); |
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mh->header_size = header_size; |
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if (mh->stream_type == 0xbb) { |
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mh->group1_bits = mlp_quants[get_bits(gb, 4)]; |
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mh->group2_bits = mlp_quants[get_bits(gb, 4)]; |
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ratebits = get_bits(gb, 4); |
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mh->group1_samplerate = mlp_samplerate(ratebits); |
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mh->group2_samplerate = mlp_samplerate(get_bits(gb, 4)); |
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skip_bits(gb, 11); |
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mh->channel_arrangement= |
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channel_arrangement = get_bits(gb, 5); |
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mh->channels_mlp = mlp_channels[channel_arrangement]; |
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mh->channel_layout_mlp = mlp_layout[channel_arrangement]; |
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} else if (mh->stream_type == 0xba) { |
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mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere? |
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mh->group2_bits = 0; |
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ratebits = get_bits(gb, 4); |
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mh->group1_samplerate = mlp_samplerate(ratebits); |
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mh->group2_samplerate = 0; |
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skip_bits(gb, 4); |
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mh->channel_modifier_thd_stream0 = get_bits(gb, 2); |
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mh->channel_modifier_thd_stream1 = get_bits(gb, 2); |
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mh->channel_arrangement= |
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channel_arrangement = get_bits(gb, 5); |
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mh->channels_thd_stream1 = truehd_channels(channel_arrangement); |
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mh->channel_layout_thd_stream1 = truehd_layout(channel_arrangement); |
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mh->channel_modifier_thd_stream2 = get_bits(gb, 2); |
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channel_arrangement = get_bits(gb, 13); |
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mh->channels_thd_stream2 = truehd_channels(channel_arrangement); |
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mh->channel_layout_thd_stream2 = truehd_layout(channel_arrangement); |
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} else |
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return AVERROR_INVALIDDATA; |
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mh->access_unit_size = 40 << (ratebits & 7); |
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mh->access_unit_size_pow2 = 64 << (ratebits & 7); |
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skip_bits_long(gb, 48); |
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mh->is_vbr = get_bits1(gb); |
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mh->peak_bitrate = (get_bits(gb, 15) * mh->group1_samplerate + 8) >> 4; |
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mh->num_substreams = get_bits(gb, 4); |
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skip_bits_long(gb, 4 + (header_size - 17) * 8); |
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return 0; |
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}
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