* 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
*/
#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"
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)
return channels;
}
+static uint64_t 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;
+}
+
+static int ff_mlp_get_major_sync_size(const uint8_t * buf, int bufsize)
+{
+ int has_extension, extensions = 0;
+ int size = 28;
+ if (bufsize < 28)
+ return -1;
+
+ if (AV_RB32(buf) == 0xf8726fba) {
+ has_extension = buf[25] & 1;
+ if (has_extension) {
+ extensions = buf[26] >> 4;
+ size += 2 + extensions * 2;
+ }
+ }
+ return size;
+}
+
/** 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.
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
{
- int ratebits;
+ int ratebits, channel_arrangement, header_size;
uint16_t checksum;
assert(get_bits_count(gb) == 0);
- if (gb->size_in_bits < 28 << 3) {
+ header_size = ff_mlp_get_major_sync_size(gb->buffer, gb->size_in_bits >> 3);
+ if (header_size < 0 || gb->size_in_bits < header_size << 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)) {
+ checksum = ff_mlp_checksum16(gb->buffer, header_size - 2);
+ if (checksum != AV_RL16(gb->buffer+header_size-2)) {
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);
+ mh->header_size = header_size;
if (mh->stream_type == 0xbb) {
mh->group1_bits = mlp_quants[get_bits(gb, 4)];
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;
mh->group1_samplerate = mlp_samplerate(ratebits);
mh->group2_samplerate = 0;
- skip_bits(gb, 8);
+ skip_bits(gb, 4);
+
+ mh->channel_modifier_thd_stream0 = get_bits(gb, 2);
+ mh->channel_modifier_thd_stream1 = get_bits(gb, 2);
- mh->channels_thd_stream1 = get_bits(gb, 5);
+ channel_arrangement = get_bits(gb, 5);
+ mh->channels_thd_stream1 = truehd_channels(channel_arrangement);
+ mh->channel_layout_thd_stream1 = truehd_layout(channel_arrangement);
- skip_bits(gb, 2);
+ mh->channel_modifier_thd_stream2 = get_bits(gb, 2);
- mh->channels_thd_stream2 = get_bits(gb, 13);
+ 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);
mh->num_substreams = get_bits(gb, 4);
- skip_bits_long(gb, 4 + 11 * 8);
+ skip_bits_long(gb, 4 + (header_size - 17) * 8);
return 0;
}
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 (avctx->request_channel_layout &&
+ (avctx->request_channel_layout & AV_CH_LAYOUT_STEREO) ==
+ avctx->request_channel_layout &&
+ 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 (avctx->request_channel_layout &&
+ (avctx->request_channel_layout & AV_CH_LAYOUT_STEREO) ==
+ avctx->request_channel_layout &&
+ mh.num_substreams > 1) {
+ avctx->channels = 2;
+ avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+ } else if (!mh.channels_thd_stream2 ||
+ (avctx->request_channel_layout &&
+ (avctx->request_channel_layout & mh.channel_layout_thd_stream1) ==
+ avctx->request_channel_layout)) {
+ 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 */
}
AVCodecParser ff_mlp_parser = {
- { CODEC_ID_MLP, CODEC_ID_TRUEHD },
- sizeof(MLPParseContext),
- mlp_init,
- mlp_parse,
- ff_parse_close,
+ .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,
};
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