diff options
Diffstat (limited to 'libavformat/brstm.c')
| -rw-r--r-- | libavformat/brstm.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/libavformat/brstm.c b/libavformat/brstm.c new file mode 100644 index 0000000000..19a4a2a96b --- /dev/null +++ b/libavformat/brstm.c @@ -0,0 +1,297 @@ +/* + * BRSTM demuxer + * Copyright (c) 2012 Paul B Mahol + * + * 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 + */ + +#include "libavutil/intreadwrite.h" +#include "libavcodec/bytestream.h" +#include "avformat.h" +#include "internal.h" + +typedef struct BRSTMDemuxContext { + uint32_t block_size; + uint32_t block_count; + uint32_t current_block; + uint32_t samples_per_block; + uint32_t last_block_used_bytes; + uint8_t *table; + uint8_t *adpc; +} BRSTMDemuxContext; + +static int probe(AVProbeData *p) +{ + if (AV_RL32(p->buf) == MKTAG('R','S','T','M') && + (AV_RL16(p->buf + 4) == 0xFFFE || + AV_RL16(p->buf + 4) == 0xFEFF)) + return AVPROBE_SCORE_MAX / 3 * 2; + return 0; +} + +static int read_close(AVFormatContext *s) +{ + BRSTMDemuxContext *b = s->priv_data; + + av_freep(&b->table); + av_freep(&b->adpc); + + return 0; +} + +static int read_header(AVFormatContext *s) +{ + BRSTMDemuxContext *b = s->priv_data; + int bom, major, minor, codec, chunk; + int64_t pos, h1offset, toffset; + uint32_t size, start, asize; + AVStream *st; + int ret = AVERROR_EOF; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + + avio_skip(s->pb, 4); + + bom = avio_rb16(s->pb); + if (bom != 0xFEFF && bom != 0xFFFE) { + av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom); + return AVERROR_INVALIDDATA; + } + if (bom == 0xFFFE) { + avpriv_request_sample(s, "little endian byte order"); + return AVERROR_PATCHWELCOME; + } + + major = avio_r8(s->pb); + minor = avio_r8(s->pb); + avio_skip(s->pb, 4); // size of file + size = avio_rb16(s->pb); + if (size < 14) + return AVERROR_INVALIDDATA; + + avio_skip(s->pb, size - 14); + pos = avio_tell(s->pb); + if (avio_rl32(s->pb) != MKTAG('H','E','A','D')) + return AVERROR_INVALIDDATA; + size = avio_rb32(s->pb); + if (size < 256) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 4); // unknown + h1offset = avio_rb32(s->pb); + if (h1offset > size) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 12); + toffset = avio_rb32(s->pb) + 16LL; + if (toffset > size) + return AVERROR_INVALIDDATA; + + avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb)); + codec = avio_r8(s->pb); + + switch (codec) { + case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break; + case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break; + case 2: codec = AV_CODEC_ID_ADPCM_THP; break; + default: + avpriv_request_sample(s, "codec %d", codec); + return AVERROR_PATCHWELCOME; + } + + avio_skip(s->pb, 1); // loop flag + st->codec->codec_id = codec; + st->codec->channels = avio_r8(s->pb); + if (!st->codec->channels) + return AVERROR_INVALIDDATA; + + avio_skip(s->pb, 1); // padding + st->codec->sample_rate = avio_rb16(s->pb); + if (!st->codec->sample_rate) + return AVERROR_INVALIDDATA; + + avio_skip(s->pb, 2); // padding + avio_skip(s->pb, 4); // loop start sample + st->start_time = 0; + st->duration = avio_rb32(s->pb); + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + + start = avio_rb32(s->pb); + b->current_block = 0; + b->block_count = avio_rb32(s->pb); + if (b->block_count > UINT16_MAX) { + av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count); + return AVERROR_INVALIDDATA; + } + + b->block_size = avio_rb32(s->pb); + if (b->block_size > UINT16_MAX / st->codec->channels) + return AVERROR_INVALIDDATA; + b->block_size *= st->codec->channels; + + b->samples_per_block = avio_rb32(s->pb); + b->last_block_used_bytes = avio_rb32(s->pb); + if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels) + return AVERROR_INVALIDDATA; + b->last_block_used_bytes *= st->codec->channels; + + avio_skip(s->pb, 4); // last block samples + avio_skip(s->pb, 4); // last block size + + if (codec == AV_CODEC_ID_ADPCM_THP) { + int ch; + + avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); + toffset = avio_rb32(s->pb) + 16LL; + if (toffset > size) + return AVERROR_INVALIDDATA; + + avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); + b->table = av_mallocz(32 * st->codec->channels); + if (!b->table) + return AVERROR(ENOMEM); + + for (ch = 0; ch < st->codec->channels; ch++) { + if (avio_read(s->pb, b->table + ch * 32, 32) != 32) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + avio_skip(s->pb, 24); + } + } + + if (size < (avio_tell(s->pb) - pos)) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); + + while (!avio_feof(s->pb)) { + chunk = avio_rl32(s->pb); + size = avio_rb32(s->pb); + if (size < 8) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + size -= 8; + switch (chunk) { + case MKTAG('A','D','P','C'): + if (codec != AV_CODEC_ID_ADPCM_THP) + goto skip; + + asize = b->block_count * st->codec->channels * 4; + if (size < asize) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + if (b->adpc) { + av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n"); + goto skip; + } else { + b->adpc = av_mallocz(asize); + if (!b->adpc) { + ret = AVERROR(ENOMEM); + goto fail; + } + avio_read(s->pb, b->adpc, asize); + avio_skip(s->pb, size - asize); + } + break; + case MKTAG('D','A','T','A'): + if ((start < avio_tell(s->pb)) || + (!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + avio_skip(s->pb, start - avio_tell(s->pb)); + + if (major != 1 || minor) + avpriv_request_sample(s, "Version %d.%d", major, minor); + + return 0; + default: + av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk); +skip: + avio_skip(s->pb, size); + } + } + +fail: + read_close(s); + + return ret; +} + +static int read_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVCodecContext *codec = s->streams[0]->codec; + BRSTMDemuxContext *b = s->priv_data; + uint32_t samples, size; + int ret; + + if (avio_feof(s->pb)) + return AVERROR_EOF; + b->current_block++; + if (b->current_block == b->block_count) { + size = b->last_block_used_bytes; + samples = size / (8 * codec->channels) * 14; + } else if (b->current_block < b->block_count) { + size = b->block_size; + samples = b->samples_per_block; + } else { + return AVERROR_EOF; + } + + if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) { + uint8_t *dst; + + if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0) + return AVERROR(ENOMEM); + dst = pkt->data; + bytestream_put_be32(&dst, size); + bytestream_put_be32(&dst, samples); + bytestream_put_buffer(&dst, b->table, 32 * codec->channels); + bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels * + (b->current_block - 1), 4 * codec->channels); + + ret = avio_read(s->pb, dst, size); + if (ret != size) + av_free_packet(pkt); + pkt->duration = samples; + } else { + ret = av_get_packet(s->pb, pkt, size); + } + + pkt->stream_index = 0; + + if (ret != size) + ret = AVERROR(EIO); + + return ret; +} + +AVInputFormat ff_brstm_demuxer = { + .name = "brstm", + .long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"), + .priv_data_size = sizeof(BRSTMDemuxContext), + .read_probe = probe, + .read_header = read_header, + .read_packet = read_packet, + .read_close = read_close, + .extensions = "brstm", +}; 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