westwood: split the AUD and VQA demuxers into separate files.

They have no code in common.

1 files changed, 251 insertions, 0 deletions

diff --git a/libavformat/westwood_vqa.c b/libavformat/westwood_vqa.c
new file mode 100644
index 0000000000..2eff4cc0a5
--- /dev/null
+++ b/libavformat/westwood_vqa.c
@@ -0,0 +1,251 @@
+/*
+ * Westwood Studios VQA Format Demuxer
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Westwood Studios VQA file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the Westwood file formats, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ *   http://www.geocities.com/SiliconValley/8682/aud3.txt
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
+#define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A')
+#define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D')
+#define FINF_TAG MKBETAG('F', 'I', 'N', 'F')
+#define SND0_TAG MKBETAG('S', 'N', 'D', '0')
+#define SND1_TAG MKBETAG('S', 'N', 'D', '1')
+#define SND2_TAG MKBETAG('S', 'N', 'D', '2')
+#define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R')
+
+/* don't know what these tags are for, but acknowledge their existence */
+#define CINF_TAG MKBETAG('C', 'I', 'N', 'F')
+#define CINH_TAG MKBETAG('C', 'I', 'N', 'H')
+#define CIND_TAG MKBETAG('C', 'I', 'N', 'D')
+#define PINF_TAG MKBETAG('P', 'I', 'N', 'F')
+#define PINH_TAG MKBETAG('P', 'I', 'N', 'H')
+#define PIND_TAG MKBETAG('P', 'I', 'N', 'D')
+#define CMDS_TAG MKBETAG('C', 'M', 'D', 'S')
+
+#define VQA_HEADER_SIZE 0x2A
+#define VQA_FRAMERATE 15
+#define VQA_PREAMBLE_SIZE 8
+
+typedef struct WsVqaDemuxContext {
+    int audio_samplerate;
+    int audio_channels;
+    int audio_bits;
+
+    int audio_stream_index;
+    int video_stream_index;
+
+    int64_t audio_frame_counter;
+} WsVqaDemuxContext;
+
+static int wsvqa_probe(AVProbeData *p)
+{
+    /* need 12 bytes to qualify */
+    if (p->buf_size < 12)
+        return 0;
+
+    /* check for the VQA signatures */
+    if ((AV_RB32(&p->buf[0]) != FORM_TAG) ||
+        (AV_RB32(&p->buf[8]) != WVQA_TAG))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int wsvqa_read_header(AVFormatContext *s,
+                             AVFormatParameters *ap)
+{
+    WsVqaDemuxContext *wsvqa = s->priv_data;
+    AVIOContext *pb = s->pb;
+    AVStream *st;
+    unsigned char *header;
+    unsigned char scratch[VQA_PREAMBLE_SIZE];
+    unsigned int chunk_tag;
+    unsigned int chunk_size;
+
+    /* initialize the video decoder stream */
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE);
+    wsvqa->video_stream_index = st->index;
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id = CODEC_ID_WS_VQA;
+    st->codec->codec_tag = 0;  /* no fourcc */
+
+    /* skip to the start of the VQA header */
+    avio_seek(pb, 20, SEEK_SET);
+
+    /* the VQA header needs to go to the decoder */
+    st->codec->extradata_size = VQA_HEADER_SIZE;
+    st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
+    header = (unsigned char *)st->codec->extradata;
+    if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
+        VQA_HEADER_SIZE) {
+        av_free(st->codec->extradata);
+        return AVERROR(EIO);
+    }
+    st->codec->width = AV_RL16(&header[6]);
+    st->codec->height = AV_RL16(&header[8]);
+
+    /* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
+    if (AV_RL16(&header[24]) || (AV_RL16(&header[0]) == 1 && AV_RL16(&header[2]) == 1)) {
+        st = avformat_new_stream(s, NULL);
+        if (!st)
+            return AVERROR(ENOMEM);
+        avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE);
+        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+        if (AV_RL16(&header[0]) == 1)
+            st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
+        else
+            st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
+        st->codec->codec_tag = 0;  /* no tag */
+        st->codec->sample_rate = AV_RL16(&header[24]);
+        if (!st->codec->sample_rate)
+            st->codec->sample_rate = 22050;
+        st->codec->channels = header[26];
+        if (!st->codec->channels)
+            st->codec->channels = 1;
+        st->codec->bits_per_coded_sample = 16;
+        st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
+            st->codec->bits_per_coded_sample / 4;
+        st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
+
+        wsvqa->audio_stream_index = st->index;
+        wsvqa->audio_samplerate = st->codec->sample_rate;
+        wsvqa->audio_channels = st->codec->channels;
+        wsvqa->audio_frame_counter = 0;
+    }
+
+    /* there are 0 or more chunks before the FINF chunk; iterate until
+     * FINF has been skipped and the file will be ready to be demuxed */
+    do {
+        if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
+            av_free(st->codec->extradata);
+            return AVERROR(EIO);
+        }
+        chunk_tag = AV_RB32(&scratch[0]);
+        chunk_size = AV_RB32(&scratch[4]);
+
+        /* catch any unknown header tags, for curiousity */
+        switch (chunk_tag) {
+        case CINF_TAG:
+        case CINH_TAG:
+        case CIND_TAG:
+        case PINF_TAG:
+        case PINH_TAG:
+        case PIND_TAG:
+        case FINF_TAG:
+        case CMDS_TAG:
+            break;
+
+        default:
+            av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n",
+                scratch[0], scratch[1],
+                scratch[2], scratch[3]);
+            break;
+        }
+
+        avio_skip(pb, chunk_size);
+    } while (chunk_tag != FINF_TAG);
+
+    return 0;
+}
+
+static int wsvqa_read_packet(AVFormatContext *s,
+                             AVPacket *pkt)
+{
+    WsVqaDemuxContext *wsvqa = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int ret = -1;
+    unsigned char preamble[VQA_PREAMBLE_SIZE];
+    unsigned int chunk_type;
+    unsigned int chunk_size;
+    int skip_byte;
+
+    while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
+        chunk_type = AV_RB32(&preamble[0]);
+        chunk_size = AV_RB32(&preamble[4]);
+        skip_byte = chunk_size & 0x01;
+
+        if ((chunk_type == SND2_TAG || chunk_type == SND1_TAG) && wsvqa->audio_channels == 0) {
+            av_log(s, AV_LOG_ERROR, "audio chunk without any audio header information found\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
+
+            if (av_new_packet(pkt, chunk_size))
+                return AVERROR(EIO);
+            ret = avio_read(pb, pkt->data, chunk_size);
+            if (ret != chunk_size) {
+                av_free_packet(pkt);
+                return AVERROR(EIO);
+            }
+
+            if (chunk_type == SND2_TAG) {
+                pkt->stream_index = wsvqa->audio_stream_index;
+                /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
+                wsvqa->audio_frame_counter += (chunk_size * 2) / wsvqa->audio_channels;
+            } else if(chunk_type == SND1_TAG) {
+                pkt->stream_index = wsvqa->audio_stream_index;
+                /* unpacked size is stored in header */
+                wsvqa->audio_frame_counter += AV_RL16(pkt->data) / wsvqa->audio_channels;
+            } else {
+                pkt->stream_index = wsvqa->video_stream_index;
+            }
+            /* stay on 16-bit alignment */
+            if (skip_byte)
+                avio_skip(pb, 1);
+
+            return ret;
+        } else {
+            switch(chunk_type){
+            case CMDS_TAG:
+            case SND0_TAG:
+                break;
+            default:
+                av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type);
+            }
+            avio_skip(pb, chunk_size + skip_byte);
+        }
+    }
+
+    return ret;
+}
+
+AVInputFormat ff_wsvqa_demuxer = {
+    .name           = "wsvqa",
+    .long_name      = NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"),
+    .priv_data_size = sizeof(WsVqaDemuxContext),
+    .read_probe     = wsvqa_probe,
+    .read_header    = wsvqa_read_header,
+    .read_packet    = wsvqa_read_packet,
+};