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Diffstat (limited to 'contrib/ffmpeg/libavcodec/mlp_parser.c')
-rw-r--r--contrib/ffmpeg/libavcodec/mlp_parser.c307
1 files changed, 0 insertions, 307 deletions
diff --git a/contrib/ffmpeg/libavcodec/mlp_parser.c b/contrib/ffmpeg/libavcodec/mlp_parser.c
deleted file mode 100644
index 96dbc5943..000000000
--- a/contrib/ffmpeg/libavcodec/mlp_parser.c
+++ /dev/null
@@ -1,307 +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.c
- * MLP parser
- */
-
-#include "bitstream.h"
-#include "parser.h"
-#include "crc.h"
-#include "mlp_parser.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,
-};
-
-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 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;
-}
-
-static int crc_init = 0;
-static AVCRC crc_2D[1024];
-
-/** MLP uses checksums that seem to be based on the standard CRC algorithm,
- * but 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)
-{
- uint16_t crc;
-
- if (!crc_init) {
- av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
- crc_init = 1;
- }
-
- crc = av_crc(crc_2D, 0, buf, buf_size - 2);
- crc ^= AV_RL16(buf + buf_size - 2);
- return crc;
-}
-
-/** 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, const uint8_t *buf,
- unsigned int buf_size)
-{
- GetBitContext gb;
- int ratebits;
- uint16_t checksum;
-
- if (buf_size < 28) {
- av_log(log, AV_LOG_ERROR, "Packet too short, unable to read major sync\n");
- return -1;
- }
-
- checksum = mlp_checksum16(buf, 26);
- if (checksum != AV_RL16(buf+26)) {
- av_log(log, AV_LOG_ERROR, "Major sync info header checksum error\n");
- return -1;
- }
-
- init_get_bits(&gb, buf, buf_size * 8);
-
- if (get_bits_long(&gb, 24) != 0xf8726f) /* Sync words */
- return -1;
-
- 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->channels_mlp = get_bits(&gb, 5);
- } 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->channels_thd_stream1 = get_bits(&gb, 5);
-
- skip_bits(&gb, 2);
-
- mh->channels_thd_stream2 = get_bits(&gb, 13);
- } else
- return -1;
-
- 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 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) {
- mp->in_sync = 1;
- mp->bytes_left = 0;
- break;
- }
- }
-
- if (!mp->in_sync) {
- ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size);
- 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) {
- ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size);
- 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;
- 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) {
- // First nibble of a frame is a parity check of the first few nibbles.
- // Only check when this isn't a sync frame - syncs have a checksum.
-
- parity_bits = 0;
- for (i = 0; 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 {
- MLPHeaderInfo mh;
-
- if (ff_mlp_read_major_sync(avctx, &mh, buf + 4, buf_size - 4) < 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->sample_rate = mh.group1_samplerate;
- avctx->frame_size = mh.access_unit_size;
-
- if (mh.stream_type == 0xbb) {
- /* MLP stream */
- avctx->channels = mlp_channels[mh.channels_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 (!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 mlp_parser = {
- { CODEC_ID_MLP },
- sizeof(MLPParseContext),
- NULL,
- mlp_parse,
- NULL,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-01 21:23:21 +0000