| /* |
| * 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 (!url_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 additonal 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 (url_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", |
| }; |