yading@11: /*
yading@11:  * BRSTM demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavcodec/bytestream.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: typedef struct BRSTMDemuxContext {
yading@11:     uint32_t    block_size;
yading@11:     uint32_t    block_count;
yading@11:     uint32_t    current_block;
yading@11:     uint32_t    samples_per_block;
yading@11:     uint32_t    last_block_used_bytes;
yading@11:     uint8_t     *table;
yading@11:     uint8_t     *adpc;
yading@11: } BRSTMDemuxContext;
yading@11: 
yading@11: static int probe(AVProbeData *p)
yading@11: {
yading@11:     if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
yading@11:         (AV_RL16(p->buf + 4) == 0xFFFE ||
yading@11:          AV_RL16(p->buf + 4) == 0xFEFF))
yading@11:         return AVPROBE_SCORE_MAX / 3 * 2;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_close(AVFormatContext *s)
yading@11: {
yading@11:     BRSTMDemuxContext *b = s->priv_data;
yading@11: 
yading@11:     av_freep(&b->table);
yading@11:     av_freep(&b->adpc);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     BRSTMDemuxContext *b = s->priv_data;
yading@11:     int bom, major, minor, codec, chunk;
yading@11:     int64_t pos, h1offset, toffset;
yading@11:     uint32_t size, start, asize;
yading@11:     AVStream *st;
yading@11:     int ret = AVERROR_EOF;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11: 
yading@11:     avio_skip(s->pb, 4);
yading@11: 
yading@11:     bom = avio_rb16(s->pb);
yading@11:     if (bom != 0xFEFF && bom != 0xFFFE) {
yading@11:         av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     if (bom == 0xFFFE) {
yading@11:         avpriv_request_sample(s, "little endian byte order");
yading@11:         return AVERROR_PATCHWELCOME;
yading@11:     }
yading@11: 
yading@11:     major = avio_r8(s->pb);
yading@11:     minor = avio_r8(s->pb);
yading@11:     avio_skip(s->pb, 4); // size of file
yading@11:     size = avio_rb16(s->pb);
yading@11:     if (size < 14)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_skip(s->pb, size - 14);
yading@11:     pos = avio_tell(s->pb);
yading@11:     if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     size = avio_rb32(s->pb);
yading@11:     if (size < 256)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     avio_skip(s->pb, 4); // unknown
yading@11:     h1offset = avio_rb32(s->pb);
yading@11:     if (h1offset > size)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     avio_skip(s->pb, 12);
yading@11:     toffset = avio_rb32(s->pb) + 16LL;
yading@11:     if (toffset > size)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
yading@11:     codec = avio_r8(s->pb);
yading@11: 
yading@11:     switch (codec) {
yading@11:     case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR;    break;
yading@11:     case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break;
yading@11:     case 2: codec = AV_CODEC_ID_ADPCM_THP;        break;
yading@11:     default:
yading@11:         avpriv_request_sample(s, "codec %d", codec);
yading@11:         return AVERROR_PATCHWELCOME;
yading@11:     }
yading@11: 
yading@11:     avio_skip(s->pb, 1); // loop flag
yading@11:     st->codec->codec_id = codec;
yading@11:     st->codec->channels = avio_r8(s->pb);
yading@11:     if (!st->codec->channels)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_skip(s->pb, 1); // padding
yading@11:     st->codec->sample_rate = avio_rb16(s->pb);
yading@11:     if (!st->codec->sample_rate)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_skip(s->pb, 2); // padding
yading@11:     avio_skip(s->pb, 4); // loop start sample
yading@11:     st->start_time = 0;
yading@11:     st->duration = avio_rb32(s->pb);
yading@11:     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11: 
yading@11:     start = avio_rb32(s->pb);
yading@11:     b->current_block = 0;
yading@11:     b->block_count = avio_rb32(s->pb);
yading@11:     if (b->block_count > UINT16_MAX) {
yading@11:         av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     b->block_size = avio_rb32(s->pb);
yading@11:     if (b->block_size > UINT16_MAX / st->codec->channels)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     b->block_size *= st->codec->channels;
yading@11: 
yading@11:     b->samples_per_block = avio_rb32(s->pb);
yading@11:     b->last_block_used_bytes = avio_rb32(s->pb);
yading@11:     if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     b->last_block_used_bytes *= st->codec->channels;
yading@11: 
yading@11:     avio_skip(s->pb, 4); // last block samples
yading@11:     avio_skip(s->pb, 4); // last block size
yading@11: 
yading@11:     if (codec == AV_CODEC_ID_ADPCM_THP) {
yading@11:         int ch;
yading@11: 
yading@11:         avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
yading@11:         toffset = avio_rb32(s->pb) + 16LL;
yading@11:         if (toffset > size)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
yading@11:         b->table = av_mallocz(32 * st->codec->channels);
yading@11:         if (!b->table)
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         for (ch = 0; ch < st->codec->channels; ch++) {
yading@11:             if (avio_read(s->pb, b->table + ch * 32, 32) != 32) {
yading@11:                 ret = AVERROR_INVALIDDATA;
yading@11:                 goto fail;
yading@11:             }
yading@11:             avio_skip(s->pb, 24);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (size < (avio_tell(s->pb) - pos)) {
yading@11:         ret = AVERROR_INVALIDDATA;
yading@11:         goto fail;
yading@11:     }
yading@11:     avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
yading@11: 
yading@11:     while (!url_feof(s->pb)) {
yading@11:         chunk = avio_rl32(s->pb);
yading@11:         size  = avio_rb32(s->pb);
yading@11:         if (size < 8) {
yading@11:             ret = AVERROR_INVALIDDATA;
yading@11:             goto fail;
yading@11:         }
yading@11:         size -= 8;
yading@11:         switch (chunk) {
yading@11:         case MKTAG('A','D','P','C'):
yading@11:             if (codec != AV_CODEC_ID_ADPCM_THP)
yading@11:                 goto skip;
yading@11: 
yading@11:             asize = b->block_count * st->codec->channels * 4;
yading@11:             if (size < asize) {
yading@11:                 ret = AVERROR_INVALIDDATA;
yading@11:                 goto fail;
yading@11:             }
yading@11:             if (b->adpc) {
yading@11:                 av_log(s, AV_LOG_WARNING, "skipping additonal ADPC chunk\n");
yading@11:                 goto skip;
yading@11:             } else {
yading@11:                 b->adpc = av_mallocz(asize);
yading@11:                 if (!b->adpc) {
yading@11:                     ret = AVERROR(ENOMEM);
yading@11:                     goto fail;
yading@11:                 }
yading@11:                 avio_read(s->pb, b->adpc, asize);
yading@11:                 avio_skip(s->pb, size - asize);
yading@11:             }
yading@11:             break;
yading@11:         case MKTAG('D','A','T','A'):
yading@11:             if ((start < avio_tell(s->pb)) ||
yading@11:                 (!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) {
yading@11:                 ret = AVERROR_INVALIDDATA;
yading@11:                 goto fail;
yading@11:             }
yading@11:             avio_skip(s->pb, start - avio_tell(s->pb));
yading@11: 
yading@11:             if (major != 1 || minor)
yading@11:                 avpriv_request_sample(s, "Version %d.%d", major, minor);
yading@11: 
yading@11:             return 0;
yading@11:         default:
yading@11:             av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
yading@11: skip:
yading@11:             avio_skip(s->pb, size);
yading@11:         }
yading@11:     }
yading@11: 
yading@11: fail:
yading@11:     read_close(s);
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     AVCodecContext *codec = s->streams[0]->codec;
yading@11:     BRSTMDemuxContext *b = s->priv_data;
yading@11:     uint32_t samples, size;
yading@11:     int ret;
yading@11: 
yading@11:     if (url_feof(s->pb))
yading@11:         return AVERROR_EOF;
yading@11:     b->current_block++;
yading@11:     if (b->current_block == b->block_count) {
yading@11:         size    = b->last_block_used_bytes;
yading@11:         samples = size / (8 * codec->channels) * 14;
yading@11:     } else if (b->current_block < b->block_count) {
yading@11:         size    = b->block_size;
yading@11:         samples = b->samples_per_block;
yading@11:     } else {
yading@11:         return AVERROR_EOF;
yading@11:     }
yading@11: 
yading@11:     if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) {
yading@11:         uint8_t *dst;
yading@11: 
yading@11:         if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0)
yading@11:             return AVERROR(ENOMEM);
yading@11:         dst = pkt->data;
yading@11:         bytestream_put_be32(&dst, size);
yading@11:         bytestream_put_be32(&dst, samples);
yading@11:         bytestream_put_buffer(&dst, b->table, 32 * codec->channels);
yading@11:         bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels *
yading@11:                                     (b->current_block - 1), 4 * codec->channels);
yading@11: 
yading@11:         ret = avio_read(s->pb, dst, size);
yading@11:         if (ret != size)
yading@11:             av_free_packet(pkt);
yading@11:         pkt->duration = samples;
yading@11:     } else {
yading@11:         ret = av_get_packet(s->pb, pkt, size);
yading@11:     }
yading@11: 
yading@11:     pkt->stream_index = 0;
yading@11: 
yading@11:     if (ret != size)
yading@11:         ret = AVERROR(EIO);
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_brstm_demuxer = {
yading@11:     .name           = "brstm",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
yading@11:     .priv_data_size = sizeof(BRSTMDemuxContext),
yading@11:     .read_probe     = probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11:     .read_close     = read_close,
yading@11:     .extensions     = "brstm",
yading@11: };