[FFmpeg-devel] [PATCH] BRSTM demuxer
Paul B Mahol
onemda at gmail.com
Mon Nov 26 01:30:36 CET 2012
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/general.texi | 1 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/brstm.c | 268 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 271 insertions(+)
create mode 100644 libavformat/brstm.c
diff --git a/doc/general.texi b/doc/general.texi
index 9e8c9ea..aa49974 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -167,6 +167,7 @@ library:
@tab Used in Z and Z95 games.
@item Brute Force & Ignorance @tab @tab X
@tab Used in the game Flash Traffic: City of Angels.
+ at item BRSTM @tab @tab X
@item BWF @tab X @tab X
@item CRI ADX @tab X @tab X
@tab Audio-only format used in console video games.
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 136ada8..5750330 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -66,6 +66,7 @@ OBJS-$(CONFIG_BINTEXT_DEMUXER) += bintext.o sauce.o
OBJS-$(CONFIG_BIT_DEMUXER) += bit.o
OBJS-$(CONFIG_BIT_MUXER) += bit.o
OBJS-$(CONFIG_BMV_DEMUXER) += bmv.o
+OBJS-$(CONFIG_BRSTM_DEMUXER) += brstm.o
OBJS-$(CONFIG_C93_DEMUXER) += c93.o vocdec.o voc.o
OBJS-$(CONFIG_CAF_DEMUXER) += cafdec.o caf.o mov.o mov_chan.o \
isom.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index eaeb51a..40105c7 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -78,6 +78,7 @@ void av_register_all(void)
REGISTER_DEMUXER (BINK, bink);
REGISTER_MUXDEMUX (BIT, bit);
REGISTER_DEMUXER (BMV, bmv);
+ REGISTER_DEMUXER (BRSTM, brstm);
REGISTER_DEMUXER (C93, c93);
REGISTER_MUXDEMUX (CAF, caf);
REGISTER_MUXDEMUX (CAVSVIDEO, cavsvideo);
diff --git a/libavformat/brstm.c b/libavformat/brstm.c
new file mode 100644
index 0000000..d5cf0fc
--- /dev/null
+++ b/libavformat/brstm.c
@@ -0,0 +1,268 @@
+/*
+ * 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/channel_layout.h"
+#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;
+ uint32_t size, start;
+ AVStream *st;
+ int64_t pos;
+ 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) {
+ av_log_ask_for_sample(s, "unsupported 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, 24);
+ 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:
+ av_log_ask_for_sample(s, "unsupported 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); // loop flag
+ st->codec->sample_rate = avio_rb16(s->pb);
+ 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;
+
+ b->table = av_mallocz(32 * st->codec->channels);
+ if (!b->table)
+ return AVERROR(ENOMEM);
+ avio_skip(s->pb, 52);
+
+ for (ch = 0; ch < st->codec->channels; ch++) {
+ if (avio_read(s->pb, b->table + ch * 32, 32) != 32)
+ return AVERROR_INVALIDDATA;
+ avio_skip(s->pb, 24);
+ }
+ }
+
+ 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;
+
+ if (size != b->block_count * st->codec->channels * 4) {
+ 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(size);
+ if (!b->adpc) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ avio_read(s->pb, b->adpc, size);
+ }
+ break;
+ case MKTAG('D','A','T','A'):
+ if (start < avio_tell(s->pb)) {
+ ret = AVERROR_INVALIDDATA;
+ goto fail;
+ }
+ avio_skip(s->pb, start - avio_tell(s->pb));
+ 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 / 16 * 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 < 0) {
+ av_free_packet(pkt);
+ return ret;
+ }
+ } else {
+ ret = av_get_packet(s->pb, pkt, size);
+ if (ret < 0)
+ return ret;
+ }
+
+ pkt->stream_index = 0;
+
+ return ret;
+}
+
+AVInputFormat ff_brstm_demuxer = {
+ .name = "brstm",
+ .long_name = NULL_IF_CONFIG_SMALL("BRSTM"),
+ .priv_data_size = sizeof(BRSTMDemuxContext),
+ .read_probe = probe,
+ .read_header = read_header,
+ .read_packet = read_packet,
+ .read_close = read_close,
+ .extensions = "brstm",
+};
--
1.7.11.4
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