summaryrefslogtreecommitdiff
path: root/libavformat/brstm.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavformat/brstm.c')
-rw-r--r--libavformat/brstm.c297
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",
+};