aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/westwood.c
diff options
context:
space:
mode:
authorMike Melanson <mike@multimedia.cx>2003-10-01 04:39:38 +0000
committerMike Melanson <mike@multimedia.cx>2003-10-01 04:39:38 +0000
commit2fdf638b0c66c22357d56f7cb205dd241b4a8c58 (patch)
treecdf625b0779d58f7a4c439ac61d6ba193911a81d /libavformat/westwood.c
parentf2f6134b9e5abb0890867d47ba8c0e293d0ba2fe (diff)
downloadffmpeg-2fdf638b0c66c22357d56f7cb205dd241b4a8c58.tar.gz
New demuxers: Sega FILM/CPK, Westwood VQA & AUD; new decoders: MS RLE &
Video-1, Apple RPZA, Cinepak, Westwood IMA ADPCM Originally committed as revision 2324 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/westwood.c')
-rw-r--r--libavformat/westwood.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/libavformat/westwood.c b/libavformat/westwood.c
new file mode 100644
index 0000000000..4254f8a8ba
--- /dev/null
+++ b/libavformat/westwood.c
@@ -0,0 +1,375 @@
+/*
+ * Westwood Studios Multimedia Formats Demuxer (VQA, AUD)
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
+ (((uint8_t*)(x))[2] << 16) | \
+ (((uint8_t*)(x))[1] << 8) | \
+ ((uint8_t*)(x))[0])
+#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \
+ (((uint8_t*)(x))[1] << 16) | \
+ (((uint8_t*)(x))[2] << 8) | \
+ ((uint8_t*)(x))[3])
+
+#define AUD_HEADER_SIZE 12
+#define AUD_CHUNK_PREAMBLE_SIZE 8
+#define AUD_CHUNK_SIGNATURE 0x0000DEAF
+
+#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
+ ( (long)(unsigned char)(ch3) | \
+ ( (long)(unsigned char)(ch2) << 8 ) | \
+ ( (long)(unsigned char)(ch1) << 16 ) | \
+ ( (long)(unsigned char)(ch0) << 24 ) )
+
+#define FORM_TAG FOURCC_TAG('F', 'O', 'R', 'M')
+#define WVQA_TAG FOURCC_TAG('W', 'V', 'Q', 'A')
+#define VQHD_TAG FOURCC_TAG('V', 'Q', 'H', 'D')
+#define FINF_TAG FOURCC_TAG('F', 'I', 'N', 'F')
+#define SND0_TAG FOURCC_TAG('S', 'N', 'D', '0')
+#define SND2_TAG FOURCC_TAG('S', 'N', 'D', '2')
+#define VQFR_TAG FOURCC_TAG('V', 'Q', 'F', 'R')
+
+#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 -EIO;
+ 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;
+
+ /* set the pts reference the same as the sample rate */
+ s->pts_num = 1;
+ s->pts_den = wsaud->audio_samplerate;
+
+ /* initialize the audio decoder stream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ 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 -EIO;
+
+ /* validate the chunk */
+ if (LE_32(&preamble[4]) != AUD_CHUNK_SIGNATURE)
+ return AVERROR_INVALIDDATA;
+
+ chunk_size = LE_16(&preamble[0]);
+ if (av_new_packet(pkt, chunk_size))
+ return -EIO;
+ pkt->stream_index = wsaud->audio_stream_index;
+ pkt->pts = wsaud->audio_frame_counter;
+ pkt->pts /= wsaud->audio_samplerate;
+ if ((ret = get_buffer(pb, pkt->data, chunk_size)) != chunk_size) {
+ av_free_packet(pkt);
+ ret = -EIO;
+ }
+
+ /* 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];
+
+ /* set the pts reference (1 pts = 1/90000) */
+ s->pts_num = 1;
+ s->pts_den = 90000;
+
+ /* initialize the video decoder stream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ 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_malloc(VQA_HEADER_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 -EIO;
+ }
+ st->codec.width = LE_16(&header[6]);
+ st->codec.height = LE_16(&header[8]);
+
+ /* initialize the audio decoder stream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ st->codec.codec_type = CODEC_TYPE_AUDIO;
+ st->codec.codec_id = CODEC_ID_ADPCM_IMA_WS;
+ st->codec.codec_tag = 0; /* no tag */
+ st->codec.sample_rate = LE_16(&header[24]);
+ st->codec.channels = header[26];
+ 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;
+
+ /* skip the useless FINF chunk index */
+ if (get_buffer(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
+ av_free(st->codec.extradata);
+ return -EIO;
+ }
+ url_fseek(pb, BE_32(&scratch[4]), SEEK_CUR);
+ 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 = 0;
+ unsigned char preamble[VQA_PREAMBLE_SIZE];
+ unsigned int chunk_type;
+ unsigned int chunk_size;
+ int skip_byte;
+
+ if (get_buffer(pb, preamble, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE)
+ return -EIO;
+
+ chunk_type = BE_32(&preamble[0]);
+ chunk_size = BE_32(&preamble[4]);
+ skip_byte = chunk_size & 0x01;
+
+ if ((chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
+
+ if (av_new_packet(pkt, chunk_size))
+ return -EIO;
+ ret = get_buffer(pb, pkt->data, chunk_size);
+ if (ret != chunk_size) {
+ av_free_packet(pkt);
+ ret = -EIO;
+ }
+
+ 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 {
+ pkt->stream_index = wsvqa->video_stream_index;
+ pkt->pts = wsvqa->video_pts;
+ wsvqa->video_pts += VQA_VIDEO_PTS_INC;
+ }
+
+ } else
+ return AVERROR_INVALIDDATA;
+
+ /* stay on 16-bit alignment */
+ if (skip_byte)
+ url_fseek(pb, 1, SEEK_CUR);
+
+ return ret;
+}
+
+static int wsvqa_read_close(AVFormatContext *s)
+{
+// WsVqaDemuxContext *wsvqa = (WsVqaDemuxContext *)s->priv_data;
+
+ return 0;
+}
+
+static AVInputFormat wsaud_iformat = {
+ "wsaud",
+ "Westwood Studios audio format",
+ sizeof(WsAudDemuxContext),
+ wsaud_probe,
+ wsaud_read_header,
+ wsaud_read_packet,
+ wsaud_read_close,
+};
+
+static AVInputFormat wsvqa_iformat = {
+ "wsvqa",
+ "Westwood Studios VQA format",
+ sizeof(WsVqaDemuxContext),
+ wsvqa_probe,
+ wsvqa_read_header,
+ wsvqa_read_packet,
+ wsvqa_read_close,
+};
+
+int westwood_init(void)
+{
+ av_register_input_format(&wsaud_iformat);
+ av_register_input_format(&wsvqa_iformat);
+ return 0;
+}