mirror of
https://github.com/FFmpeg/FFmpeg.git
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294 lines
8.5 KiB
C
294 lines
8.5 KiB
C
/*
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* BRSTM demuxer
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* Copyright (c) 2012 Paul B Mahol
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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 "libavutil/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct BRSTMDemuxContext {
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uint32_t block_size;
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uint32_t block_count;
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uint32_t current_block;
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uint32_t samples_per_block;
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uint32_t last_block_used_bytes;
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uint8_t *table;
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uint8_t *adpc;
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} BRSTMDemuxContext;
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static int probe(AVProbeData *p)
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{
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if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
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(AV_RL16(p->buf + 4) == 0xFFFE ||
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AV_RL16(p->buf + 4) == 0xFEFF))
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return AVPROBE_SCORE_MAX / 3 * 2;
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return 0;
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}
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static int read_close(AVFormatContext *s)
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{
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BRSTMDemuxContext *b = s->priv_data;
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av_freep(&b->table);
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av_freep(&b->adpc);
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return 0;
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}
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static int read_header(AVFormatContext *s)
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{
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BRSTMDemuxContext *b = s->priv_data;
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int bom, major, minor, codec, chunk;
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int64_t pos, h1offset, toffset;
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uint32_t size, start, asize;
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AVStream *st;
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int ret = AVERROR_EOF;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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avio_skip(s->pb, 4);
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bom = avio_rb16(s->pb);
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if (bom != 0xFEFF && bom != 0xFFFE) {
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av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
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return AVERROR_INVALIDDATA;
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}
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if (bom == 0xFFFE) {
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av_log_ask_for_sample(s, "unsupported byte order");
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return AVERROR_PATCHWELCOME;
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}
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major = avio_r8(s->pb);
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minor = avio_r8(s->pb);
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avio_skip(s->pb, 4); // size of file
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size = avio_rb16(s->pb);
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if (size < 14)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, size - 14);
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pos = avio_tell(s->pb);
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if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
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return AVERROR_INVALIDDATA;
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size = avio_rb32(s->pb);
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if (size < 256)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 4); // unknown
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h1offset = avio_rb32(s->pb);
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if (h1offset > size)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 12);
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toffset = avio_rb32(s->pb) + 16LL;
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if (toffset > size)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
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codec = avio_r8(s->pb);
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switch (codec) {
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case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break;
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case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break;
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case 2: codec = AV_CODEC_ID_ADPCM_THP; break;
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default:
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av_log_ask_for_sample(s, "unsupported codec: %d", codec);
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return AVERROR_PATCHWELCOME;
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}
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avio_skip(s->pb, 1); // loop flag
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st->codec->codec_id = codec;
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st->codec->channels = avio_r8(s->pb);
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if (!st->codec->channels)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 1); // padding
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st->codec->sample_rate = avio_rb16(s->pb);
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if (!st->codec->sample_rate)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 2); // padding
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avio_skip(s->pb, 4); // loop start sample
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st->start_time = 0;
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st->duration = avio_rb32(s->pb);
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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start = avio_rb32(s->pb);
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b->current_block = 0;
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b->block_count = avio_rb32(s->pb);
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if (b->block_count > UINT16_MAX) {
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av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count);
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return AVERROR_INVALIDDATA;
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}
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b->block_size = avio_rb32(s->pb);
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if (b->block_size > UINT16_MAX / st->codec->channels)
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return AVERROR_INVALIDDATA;
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b->block_size *= st->codec->channels;
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b->samples_per_block = avio_rb32(s->pb);
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b->last_block_used_bytes = avio_rb32(s->pb);
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if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels)
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return AVERROR_INVALIDDATA;
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b->last_block_used_bytes *= st->codec->channels;
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avio_skip(s->pb, 4); // last block samples
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avio_skip(s->pb, 4); // last block size
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if (codec == AV_CODEC_ID_ADPCM_THP) {
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int ch;
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avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
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toffset = avio_rb32(s->pb) + 16LL;
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if (toffset > size)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
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b->table = av_mallocz(32 * st->codec->channels);
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if (!b->table)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < st->codec->channels; ch++) {
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if (avio_read(s->pb, b->table + ch * 32, 32) != 32) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_skip(s->pb, 24);
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}
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}
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if (size < (avio_tell(s->pb) - pos)) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
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while (!url_feof(s->pb)) {
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chunk = avio_rl32(s->pb);
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size = avio_rb32(s->pb);
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if (size < 8) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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size -= 8;
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switch (chunk) {
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case MKTAG('A','D','P','C'):
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if (codec != AV_CODEC_ID_ADPCM_THP)
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goto skip;
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asize = b->block_count * st->codec->channels * 4;
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if (size < asize) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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if (b->adpc) {
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av_log(s, AV_LOG_WARNING, "skipping additonal ADPC chunk\n");
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goto skip;
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} else {
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b->adpc = av_mallocz(asize);
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if (!b->adpc) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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avio_read(s->pb, b->adpc, asize);
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avio_skip(s->pb, size - asize);
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}
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break;
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case MKTAG('D','A','T','A'):
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if ((start < avio_tell(s->pb)) ||
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(!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_skip(s->pb, start - avio_tell(s->pb));
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return 0;
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default:
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av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
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skip:
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avio_skip(s->pb, size);
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}
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}
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fail:
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read_close(s);
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return ret;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecContext *codec = s->streams[0]->codec;
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BRSTMDemuxContext *b = s->priv_data;
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uint32_t samples, size;
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int ret;
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if (url_feof(s->pb))
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return AVERROR_EOF;
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b->current_block++;
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if (b->current_block == b->block_count) {
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size = b->last_block_used_bytes;
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samples = size / 16 * 14;
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} else if (b->current_block < b->block_count) {
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size = b->block_size;
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samples = b->samples_per_block;
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} else {
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return AVERROR_EOF;
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}
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if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) {
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uint8_t *dst;
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if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0)
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return AVERROR(ENOMEM);
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dst = pkt->data;
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bytestream_put_be32(&dst, size);
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bytestream_put_be32(&dst, samples);
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bytestream_put_buffer(&dst, b->table, 32 * codec->channels);
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bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels *
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(b->current_block - 1), 4 * codec->channels);
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ret = avio_read(s->pb, dst, size);
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if (ret != size)
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av_free_packet(pkt);
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pkt->duration = samples;
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} else {
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ret = av_get_packet(s->pb, pkt, size);
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}
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pkt->stream_index = 0;
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if (ret != size)
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ret = AVERROR(EIO);
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return ret;
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}
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AVInputFormat ff_brstm_demuxer = {
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.name = "brstm",
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.long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
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.priv_data_size = sizeof(BRSTMDemuxContext),
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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.read_close = read_close,
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.extensions = "brstm",
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};
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