1 files changed, 414 insertions, 0 deletions

diff --git a/contrib/ffmpeg/libavformat/westwood.c b/contrib/ffmpeg/libavformat/westwood.c
new file mode 100644
index 000000000..5c42e3b55
--- /dev/null
+++ b/contrib/ffmpeg/libavformat/westwood.c
@@ -0,0 +1,414 @@
+/*
+ * Westwood Studios Multimedia Formats Demuxer (VQA, AUD)
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * 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
+ */
+
+/**
+ * @file westwood.c
+ * Westwood Studios VQA & AUD file demuxers
+ * 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
+ *
+ * Implementation note: There is no definite file signature for AUD files.
+ * The demuxer uses a probabilistic strategy for content detection. This
+ * entails performing sanity checks on certain header values in order to
+ * qualify a file. Refer to wsaud_probe() for the precise parameters.
+ */
+
+#include "avformat.h"
+
+#define AUD_HEADER_SIZE 12
+#define AUD_CHUNK_PREAMBLE_SIZE 8
+#define AUD_CHUNK_SIGNATURE 0x0000DEAF
+
+#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_VIDEO_PTS_INC (90000 / VQA_FRAMERATE)
+#define VQA_PREAMBLE_SIZE 8
+
+typedef struct WsAudDemuxContext {
+    int audio_samplerate;
+    int audio_channels;
+    int audio_bits;
+    int audio_type;
+    int audio_stream_index;
+    int64_t audio_frame_counter;
+} WsAudDemuxContext;
+
+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;
+    int64_t video_pts;
+} WsVqaDemuxContext;
+
+static int wsaud_probe(AVProbeData *p)
+{
+    int field;
+
+    /* Probabilistic content detection strategy: There is no file signature
+     * so perform sanity checks on various header parameters:
+     *   8000 <= sample rate (16 bits) <= 48000  ==> 40001 acceptable numbers
+     *   compression type (8 bits) = 1 or 99     ==> 2 acceptable numbers
+     * There is a total of 24 bits. The number space contains 2^24 =
+     * 16777216 numbers. There are 40001 * 2 = 80002 acceptable combinations
+     * of numbers. There is a 80002/16777216 = 0.48% chance of a false
+     * positive.
+     */
+
+    if (p->buf_size < AUD_HEADER_SIZE)
+        return 0;
+
+    /* check sample rate */
+    field = LE_16(&p->buf[0]);
+    if ((field < 8000) || (field > 48000))
+        return 0;
+
+    /* note: only check for WS IMA (type 99) right now since there is no
+     * support for type 1 */
+    if (p->buf[11] != 99)
+        return 0;
+
+    /* return 1/2 certainty since this file check is a little sketchy */
+    return AVPROBE_SCORE_MAX / 2;
+}
+
+static int wsaud_read_header(AVFormatContext *s,
+                             AVFormatParameters *ap)
+{
+    WsAudDemuxContext *wsaud = (WsAudDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    unsigned char header[AUD_HEADER_SIZE];
+
+    if (get_buffer(pb, header, AUD_HEADER_SIZE) != AUD_HEADER_SIZE)
+        return AVERROR_IO;
+    wsaud->audio_samplerate = LE_16(&header[0]);
+    if (header[11] == 99)
+        wsaud->audio_type = CODEC_ID_ADPCM_IMA_WS;
+    else
+        return AVERROR_INVALIDDATA;
+
+    /* flag 0 indicates stereo */
+    wsaud->audio_channels = (header[10] & 0x1) + 1;
+    /* flag 1 indicates 16 bit audio */
+    wsaud->audio_bits = (((header[10] & 0x2) >> 1) + 1) * 8;
+
+    /* initialize the audio decoder stream */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    av_set_pts_info(st, 33, 1, wsaud->audio_samplerate);
+    st->codec->codec_type = CODEC_TYPE_AUDIO;
+    st->codec->codec_id = wsaud->audio_type;
+    st->codec->codec_tag = 0;  /* no tag */
+    st->codec->channels = wsaud->audio_channels;
+    st->codec->sample_rate = wsaud->audio_samplerate;
+    st->codec->bits_per_sample = wsaud->audio_bits;
+    st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
+        st->codec->bits_per_sample / 4;
+    st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
+
+    wsaud->audio_stream_index = st->index;
+    wsaud->audio_frame_counter = 0;
+
+    return 0;
+}
+
+static int wsaud_read_packet(AVFormatContext *s,
+                             AVPacket *pkt)
+{
+    WsAudDemuxContext *wsaud = (WsAudDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    unsigned char preamble[AUD_CHUNK_PREAMBLE_SIZE];
+    unsigned int chunk_size;
+    int ret = 0;
+
+    if (get_buffer(pb, preamble, AUD_CHUNK_PREAMBLE_SIZE) !=
+        AUD_CHUNK_PREAMBLE_SIZE)
+        return AVERROR_IO;
+
+    /* validate the chunk */
+    if (LE_32(&preamble[4]) != AUD_CHUNK_SIGNATURE)
+        return AVERROR_INVALIDDATA;
+
+    chunk_size = LE_16(&preamble[0]);
+    ret= av_get_packet(pb, pkt, chunk_size);
+    if (ret != chunk_size)
+        return AVERROR_IO;
+    pkt->stream_index = wsaud->audio_stream_index;
+    pkt->pts = wsaud->audio_frame_counter;
+    pkt->pts /= wsaud->audio_samplerate;
+
+    /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
+    wsaud->audio_frame_counter += (chunk_size * 2) / wsaud->audio_channels;
+
+    return ret;
+}
+
+static int wsaud_read_close(AVFormatContext *s)
+{
+//    WsAudDemuxContext *wsaud = (WsAudDemuxContext *)s->priv_data;
+
+    return 0;
+}
+
+
+static int wsvqa_probe(AVProbeData *p)
+{
+    /* need 12 bytes to qualify */
+    if (p->buf_size < 12)
+        return 0;
+
+    /* check for the VQA signatures */
+    if ((BE_32(&p->buf[0]) != FORM_TAG) ||
+        (BE_32(&p->buf[8]) != WVQA_TAG))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int wsvqa_read_header(AVFormatContext *s,
+                             AVFormatParameters *ap)
+{
+    WsVqaDemuxContext *wsvqa = (WsVqaDemuxContext *)s->priv_data;
+    ByteIOContext *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 = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    av_set_pts_info(st, 33, 1, 90000);
+    wsvqa->video_stream_index = st->index;
+    st->codec->codec_type = CODEC_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 */
+    url_fseek(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 (get_buffer(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
+        VQA_HEADER_SIZE) {
+        av_free(st->codec->extradata);
+        return AVERROR_IO;
+    }
+    st->codec->width = LE_16(&header[6]);
+    st->codec->height = LE_16(&header[8]);
+
+    st->codec->time_base.num = 1;
+    st->codec->time_base.den = VQA_FRAMERATE;
+
+    /* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
+    if (LE_16(&header[24]) || (LE_16(&header[0]) == 1)) {
+        st = av_new_stream(s, 0);
+        if (!st)
+            return AVERROR_NOMEM;
+        av_set_pts_info(st, 33, 1, 90000);
+        st->codec->codec_type = CODEC_TYPE_AUDIO;
+        if (LE_16(&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 = LE_16(&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_sample = 16;
+        st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
+            st->codec->bits_per_sample / 4;
+        st->codec->block_align = st->codec->channels * st->codec->bits_per_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 (get_buffer(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
+            av_free(st->codec->extradata);
+            return AVERROR_IO;
+        }
+        chunk_tag = BE_32(&scratch[0]);
+        chunk_size = BE_32(&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;
+        }
+
+        url_fseek(pb, chunk_size, SEEK_CUR);
+    } while (chunk_tag != FINF_TAG);
+
+    wsvqa->video_pts = wsvqa->audio_frame_counter = 0;
+
+    return 0;
+}
+
+static int wsvqa_read_packet(AVFormatContext *s,
+                             AVPacket *pkt)
+{
+    WsVqaDemuxContext *wsvqa = (WsVqaDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int ret = -1;
+    unsigned char preamble[VQA_PREAMBLE_SIZE];
+    unsigned int chunk_type;
+    unsigned int chunk_size;
+    int skip_byte;
+
+    while (get_buffer(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
+        chunk_type = BE_32(&preamble[0]);
+        chunk_size = BE_32(&preamble[4]);
+        skip_byte = chunk_size & 0x01;
+
+        if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
+
+            if (av_new_packet(pkt, chunk_size))
+                return AVERROR_IO;
+            ret = get_buffer(pb, pkt->data, chunk_size);
+            if (ret != chunk_size) {
+                av_free_packet(pkt);
+                return AVERROR_IO;
+            }
+
+            if (chunk_type == SND2_TAG) {
+                pkt->stream_index = wsvqa->audio_stream_index;
+
+                pkt->pts = 90000;
+                pkt->pts *= wsvqa->audio_frame_counter;
+                pkt->pts /= wsvqa->audio_samplerate;
+
+                /* 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;
+
+                pkt->pts = 90000;
+                pkt->pts *= wsvqa->audio_frame_counter;
+                pkt->pts /= wsvqa->audio_samplerate;
+
+                /* unpacked size is stored in header */
+                wsvqa->audio_frame_counter += LE_16(pkt->data) / wsvqa->audio_channels;
+            } else {
+                pkt->stream_index = wsvqa->video_stream_index;
+                pkt->pts = wsvqa->video_pts;
+                wsvqa->video_pts += VQA_VIDEO_PTS_INC;
+            }
+            /* stay on 16-bit alignment */
+            if (skip_byte)
+                url_fseek(pb, 1, SEEK_CUR);
+
+            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);
+            }
+            url_fseek(pb, chunk_size + skip_byte, SEEK_CUR);
+        }
+    }
+
+    return ret;
+}
+
+static int wsvqa_read_close(AVFormatContext *s)
+{
+//    WsVqaDemuxContext *wsvqa = (WsVqaDemuxContext *)s->priv_data;
+
+    return 0;
+}
+
+#ifdef CONFIG_WSAUD_DEMUXER
+AVInputFormat wsaud_demuxer = {
+    "wsaud",
+    "Westwood Studios audio format",
+    sizeof(WsAudDemuxContext),
+    wsaud_probe,
+    wsaud_read_header,
+    wsaud_read_packet,
+    wsaud_read_close,
+};
+#endif
+#ifdef CONFIG_WSVQA_DEMUXER
+AVInputFormat wsvqa_demuxer = {
+    "wsvqa",
+    "Westwood Studios VQA format",
+    sizeof(WsVqaDemuxContext),
+    wsvqa_probe,
+    wsvqa_read_header,
+    wsvqa_read_packet,
+    wsvqa_read_close,
+};
+#endif