482 lines
15 KiB
C
Executable file
482 lines
15 KiB
C
Executable file
/*
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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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uint32_t last_block_size;
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uint32_t last_block_samples;
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uint32_t data_start;
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uint8_t *table;
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uint8_t *adpc;
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int little_endian;
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} BRSTMDemuxContext;
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static int probe(const 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 probe_bfstm(const AVProbeData *p)
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{
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if ((AV_RL32(p->buf) == MKTAG('F','S','T','M') ||
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AV_RL32(p->buf) == MKTAG('C','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 av_always_inline unsigned int read16(AVFormatContext *s)
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{
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BRSTMDemuxContext *b = s->priv_data;
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if (b->little_endian)
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return avio_rl16(s->pb);
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else
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return avio_rb16(s->pb);
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}
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static av_always_inline unsigned int read32(AVFormatContext *s)
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{
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BRSTMDemuxContext *b = s->priv_data;
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if (b->little_endian)
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return avio_rl32(s->pb);
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else
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return avio_rb32(s->pb);
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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 h1offset, pos, toffset;
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uint32_t size, asize, start = 0;
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AVStream *st;
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int ret = AVERROR_EOF;
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int loop = 0;
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int bfstm = !strcmp("bfstm", s->iformat->name);
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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->codecpar->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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b->little_endian = 1;
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if (!bfstm) {
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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 = read16(s);
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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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} else {
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uint32_t info_offset = 0;
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uint16_t section_count, header_size, i;
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header_size = read16(s); // 6
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avio_skip(s->pb, 4); // Unknown constant 0x00030000
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avio_skip(s->pb, 4); // size of file
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section_count = read16(s);
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avio_skip(s->pb, 2); // padding
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for (i = 0; avio_tell(s->pb) < header_size
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&& !(start && info_offset)
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&& i < section_count; i++) {
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uint16_t flag = read16(s);
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avio_skip(s->pb, 2);
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switch (flag) {
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case 0x4000:
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info_offset = read32(s);
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/*info_size =*/ read32(s);
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break;
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case 0x4001:
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avio_skip(s->pb, 4); // seek offset
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avio_skip(s->pb, 4); // seek size
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break;
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case 0x4002:
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start = read32(s) + 8;
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avio_skip(s->pb, 4); //data_size = read32(s);
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break;
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case 0x4003:
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avio_skip(s->pb, 4); // REGN offset
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avio_skip(s->pb, 4); // REGN size
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break;
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}
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}
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if (!info_offset || !start)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, info_offset - avio_tell(s->pb));
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pos = avio_tell(s->pb);
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if (avio_rl32(s->pb) != MKTAG('I','N','F','O'))
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return AVERROR_INVALIDDATA;
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}
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size = read32(s);
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if (size < 40)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 4); // unknown
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h1offset = read32(s);
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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 = read32(s) + 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 = b->little_endian ?
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AV_CODEC_ID_PCM_S16LE_PLANAR :
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AV_CODEC_ID_PCM_S16BE_PLANAR; break;
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case 2: codec = b->little_endian ?
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AV_CODEC_ID_ADPCM_THP_LE :
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AV_CODEC_ID_ADPCM_THP; break;
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default:
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avpriv_request_sample(s, "codec %d", codec);
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return AVERROR_PATCHWELCOME;
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}
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loop = avio_r8(s->pb); // loop flag
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st->codecpar->codec_id = codec;
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st->codecpar->channels = avio_r8(s->pb);
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if (!st->codecpar->channels)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 1); // padding
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st->codecpar->sample_rate = bfstm ? read32(s) : read16(s);
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if (st->codecpar->sample_rate <= 0)
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return AVERROR_INVALIDDATA;
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if (!bfstm)
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avio_skip(s->pb, 2); // padding
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if (loop) {
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if (av_dict_set_int(&s->metadata, "loop_start",
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av_rescale(read32(s), AV_TIME_BASE,
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st->codecpar->sample_rate),
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0) < 0)
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return AVERROR(ENOMEM);
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} else {
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avio_skip(s->pb, 4);
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}
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st->start_time = 0;
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st->duration = read32(s);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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if (!bfstm)
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start = read32(s);
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b->current_block = 0;
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b->block_count = read32(s);
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if (b->block_count > UINT16_MAX) {
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av_log(s, AV_LOG_WARNING, "too many blocks: %"PRIu32"\n", b->block_count);
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return AVERROR_INVALIDDATA;
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}
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b->block_size = read32(s);
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if (b->block_size > UINT32_MAX / st->codecpar->channels)
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return AVERROR_INVALIDDATA;
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b->samples_per_block = read32(s);
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b->last_block_used_bytes = read32(s);
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b->last_block_samples = read32(s);
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b->last_block_size = read32(s);
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if (b->last_block_size > UINT32_MAX / st->codecpar->channels)
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return AVERROR_INVALIDDATA;
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if (b->last_block_used_bytes > b->last_block_size)
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return AVERROR_INVALIDDATA;
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if (codec == AV_CODEC_ID_ADPCM_THP || codec == AV_CODEC_ID_ADPCM_THP_LE) {
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int ch;
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avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
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if (!bfstm)
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toffset = read32(s) + 16LL;
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else
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toffset = toffset + read32(s) + st->codecpar->channels * 8 - 8;
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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->codecpar->channels);
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if (!b->table)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < st->codecpar->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, bfstm ? 14 : 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 (!avio_feof(s->pb)) {
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chunk = avio_rl32(s->pb);
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size = read32(s);
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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('S','E','E','K'):
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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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codec != AV_CODEC_ID_ADPCM_THP_LE)
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goto skip;
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asize = b->block_count * st->codecpar->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 additional 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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if (bfstm && codec != AV_CODEC_ID_ADPCM_THP_LE) {
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// Big-endian BFSTMs have little-endian SEEK tables
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// for some strange reason.
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int i;
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for (i = 0; i < asize; i += 2) {
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b->adpc[i+1] = avio_r8(s->pb);
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b->adpc[i] = avio_r8(s->pb);
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}
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} else {
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avio_read(s->pb, b->adpc, asize);
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}
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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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codec == AV_CODEC_ID_ADPCM_THP_LE))) {
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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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if (bfstm && (codec == AV_CODEC_ID_ADPCM_THP ||
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codec == AV_CODEC_ID_ADPCM_THP_LE))
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avio_skip(s->pb, 24);
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b->data_start = avio_tell(s->pb);
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if (!bfstm && (major != 1 || minor))
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avpriv_request_sample(s, "Version %d.%d", major, minor);
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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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AVCodecParameters *par = s->streams[0]->codecpar;
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BRSTMDemuxContext *b = s->priv_data;
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uint32_t samples, size, skip = 0;
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int ret, i;
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if (avio_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 = b->last_block_samples;
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skip = b->last_block_size - b->last_block_used_bytes;
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if (samples < size * 14 / 8) {
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uint32_t adjusted_size = samples / 14 * 8;
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if (samples % 14)
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adjusted_size += (samples % 14 + 1) / 2 + 1;
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skip += size - adjusted_size;
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size = adjusted_size;
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}
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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 (par->codec_id == AV_CODEC_ID_ADPCM_THP ||
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par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
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uint8_t *dst;
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if (!b->adpc) {
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av_log(s, AV_LOG_ERROR, "adpcm_thp requires ADPC chunk, but none was found.\n");
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return AVERROR_INVALIDDATA;
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}
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if (!b->table) {
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b->table = av_mallocz(32 * par->channels);
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if (!b->table)
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return AVERROR(ENOMEM);
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}
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if (size > (INT_MAX - 32 - 4) ||
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(32 + 4 + size) > (INT_MAX / par->channels) ||
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(32 + 4 + size) * par->channels > INT_MAX - 8)
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return AVERROR_INVALIDDATA;
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if ((ret = av_new_packet(pkt, 8 + (32 + 4 + size) * par->channels)) < 0)
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return ret;
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dst = pkt->data;
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if (par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
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bytestream_put_le32(&dst, size * par->channels);
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bytestream_put_le32(&dst, samples);
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} else {
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bytestream_put_be32(&dst, size * par->channels);
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bytestream_put_be32(&dst, samples);
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}
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bytestream_put_buffer(&dst, b->table, 32 * par->channels);
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bytestream_put_buffer(&dst, b->adpc + 4 * par->channels *
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(b->current_block - 1), 4 * par->channels);
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for (i = 0; i < par->channels; i++) {
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ret = avio_read(s->pb, dst, size);
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dst += size;
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avio_skip(s->pb, skip);
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if (ret != size) {
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return AVERROR(EIO);
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}
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}
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pkt->duration = samples;
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} else {
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size *= par->channels;
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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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static int read_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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AVStream *st = s->streams[stream_index];
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BRSTMDemuxContext *b = s->priv_data;
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int64_t ret = 0;
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timestamp /= b->samples_per_block;
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ret = avio_seek(s->pb, b->data_start + timestamp * b->block_size *
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st->codecpar->channels, SEEK_SET);
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if (ret < 0)
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return ret;
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b->current_block = timestamp;
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ff_update_cur_dts(s, st, timestamp * b->samples_per_block);
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return 0;
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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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.read_seek = read_seek,
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.extensions = "brstm",
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};
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AVInputFormat ff_bfstm_demuxer = {
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.name = "bfstm",
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.long_name = NULL_IF_CONFIG_SMALL("BFSTM (Binary Cafe Stream)"),
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.priv_data_size = sizeof(BRSTMDemuxContext),
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.read_probe = probe_bfstm,
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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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.read_seek = read_seek,
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.extensions = "bfstm,bcstm",
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};
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