BRSTM demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 294 insertions, 0 deletions

diff --git a/libavformat/brstm.c b/libavformat/brstm.c
new file mode 100644
index 0000000000..a4db35a9be
--- /dev/null
+++ b/libavformat/brstm.c
@@ -0,0 +1,294 @@
+/*
+ * 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) {
+        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, 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:
+        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); // 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));
+            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;
+        }
+        pkt->duration = samples;
+    } 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 (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",
+};