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-rw-r--r--libavcodec/mlpdec.c92
1 files changed, 77 insertions, 15 deletions
diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index cae5136efb..d587982e8c 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -2,20 +2,20 @@
* MLP decoder
* Copyright (c) 2007-2008 Ian Caulfield
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -128,6 +128,9 @@ typedef struct MLPDecodeContext {
/// Index of the last substream to decode - further substreams are skipped.
uint8_t max_decoded_substream;
+ /// Stream needs channel reordering to comply with FFmpeg's channel order
+ uint8_t needs_reordering;
+
/// number of PCM samples contained in each frame
int access_unit_size;
/// next power of two above the number of samples in each frame
@@ -324,6 +327,32 @@ static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
m->substream[substr].restart_seen = 0;
+ if (mh.stream_type == 0xbb) {
+ /* MLP stream */
+ m->avctx->channel_layout = ff_mlp_layout[mh.channels_mlp];
+ } else { /* mh.stream_type == 0xba */
+ /* TrueHD stream */
+ if (mh.channels_thd_stream2) {
+ m->avctx->channel_layout = ff_truehd_layout(mh.channels_thd_stream2);
+ } else {
+ m->avctx->channel_layout = ff_truehd_layout(mh.channels_thd_stream1);
+ }
+ if (m->avctx->channels<=2 && m->avctx->channel_layout == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) {
+ av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n");
+ m->max_decoded_substream = 0;
+ if (m->avctx->channels==2)
+ m->avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+ }
+ if (m->avctx->channels &&
+ !m->avctx->request_channels && !m->avctx->request_channel_layout &&
+ av_get_channel_layout_nb_channels(m->avctx->channel_layout) != m->avctx->channels) {
+ m->avctx->channel_layout = 0;
+ av_log_ask_for_sample(m->avctx, "Unknown channel layout.");
+ }
+ }
+
+ m->needs_reordering = mh.channels_mlp >= 18 && mh.channels_mlp <= 20;
+
return 0;
}
@@ -343,6 +372,7 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
const int max_matrix_channel = m->avctx->codec_id == AV_CODEC_ID_MLP
? MAX_MATRIX_CHANNEL_MLP
: MAX_MATRIX_CHANNEL_TRUEHD;
+ int max_channel, min_channel, matrix_channel;
sync_word = get_bits(gbp, 13);
@@ -361,18 +391,18 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
skip_bits(gbp, 16); /* Output timestamp */
- s->min_channel = get_bits(gbp, 4);
- s->max_channel = get_bits(gbp, 4);
- s->max_matrix_channel = get_bits(gbp, 4);
+ min_channel = get_bits(gbp, 4);
+ max_channel = get_bits(gbp, 4);
+ matrix_channel = get_bits(gbp, 4);
- if (s->max_matrix_channel > max_matrix_channel) {
+ if (matrix_channel > max_matrix_channel) {
av_log(m->avctx, AV_LOG_ERROR,
"Max matrix channel cannot be greater than %d.\n",
max_matrix_channel);
return AVERROR_INVALIDDATA;
}
- if (s->max_channel != s->max_matrix_channel) {
+ if (max_channel != matrix_channel) {
av_log(m->avctx, AV_LOG_ERROR,
"Max channel must be equal max matrix channel.\n");
return AVERROR_INVALIDDATA;
@@ -380,19 +410,23 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
/* This should happen for TrueHD streams with >6 channels and MLP's noise
* type. It is not yet known if this is allowed. */
- if (s->max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) {
+ if (max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) {
av_log_ask_for_sample(m->avctx,
"Number of channels %d is larger than the maximum supported "
- "by the decoder.\n", s->max_channel + 2);
+ "by the decoder.\n", max_channel + 2);
return AVERROR_PATCHWELCOME;
}
- if (s->min_channel > s->max_channel) {
+ if (min_channel > max_channel) {
av_log(m->avctx, AV_LOG_ERROR,
"Substream min channel cannot be greater than max channel.\n");
return AVERROR_INVALIDDATA;
}
+ s->min_channel = min_channel;
+ s->max_channel = max_channel;
+ s->max_matrix_channel = matrix_channel;
+
if (m->avctx->request_channels > 0
&& s->max_channel + 1 >= m->avctx->request_channels
&& substr < m->max_decoded_substream) {
@@ -434,6 +468,33 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
s->ch_assign[ch_assign] = ch;
}
+ if (m->avctx->codec_id == AV_CODEC_ID_MLP && m->needs_reordering) {
+ if (m->avctx->channel_layout == (AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY) ||
+ m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0_BACK) {
+ int i = s->ch_assign[4];
+ s->ch_assign[4] = s->ch_assign[3];
+ s->ch_assign[3] = s->ch_assign[2];
+ s->ch_assign[2] = i;
+ } else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK) {
+ FFSWAP(int, s->ch_assign[2], s->ch_assign[4]);
+ FFSWAP(int, s->ch_assign[3], s->ch_assign[5]);
+ }
+ }
+ if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD &&
+ (m->avctx->channel_layout == AV_CH_LAYOUT_7POINT1 ||
+ m->avctx->channel_layout == AV_CH_LAYOUT_7POINT1_WIDE)) {
+ FFSWAP(int, s->ch_assign[4], s->ch_assign[6]);
+ FFSWAP(int, s->ch_assign[5], s->ch_assign[7]);
+ } else if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD &&
+ (m->avctx->channel_layout == AV_CH_LAYOUT_6POINT1 ||
+ m->avctx->channel_layout == (AV_CH_LAYOUT_6POINT1 | AV_CH_TOP_CENTER) ||
+ m->avctx->channel_layout == (AV_CH_LAYOUT_6POINT1 | AV_CH_TOP_FRONT_CENTER))) {
+ int i = s->ch_assign[6];
+ s->ch_assign[6] = s->ch_assign[5];
+ s->ch_assign[5] = s->ch_assign[4];
+ s->ch_assign[4] = i;
+ }
+
checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
if (checksum != get_bits(gbp, 8))
@@ -481,7 +542,7 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
int i, order;
// Filter is 0 for FIR, 1 for IIR.
- assert(filter < 2);
+ av_assert0(filter < 2);
if (m->filter_changed[channel][filter]++ > 1) {
av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n");
@@ -681,7 +742,7 @@ static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp,
if (get_bits1(gbp)) {
s->blocksize = get_bits(gbp, 9);
if (s->blocksize < 8 || s->blocksize > m->access_unit_size) {
- av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.");
+ av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.\n");
s->blocksize = 0;
return AVERROR_INVALIDDATA;
}
@@ -1144,6 +1205,7 @@ error:
return AVERROR_INVALIDDATA;
}
+#if CONFIG_MLP_DECODER
AVCodec ff_mlp_decoder = {
.name = "mlp",
.type = AVMEDIA_TYPE_AUDIO,
@@ -1154,7 +1216,7 @@ AVCodec ff_mlp_decoder = {
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"),
};
-
+#endif
#if CONFIG_TRUEHD_DECODER
AVCodec ff_truehd_decoder = {
.name = "truehd",
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-10 03:02:19 +0000