From 3ef8be2bfc89672060a2a2f2b8926b3decb08172 Mon Sep 17 00:00:00 2001 From: Mike Melanson Date: Tue, 2 Sep 2003 04:32:02 +0000 Subject: initial commit for Id RoQ and Interplay MVE multimedia subsystems Originally committed as revision 2195 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/idroq.c | 299 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 299 insertions(+) create mode 100644 libavformat/idroq.c (limited to 'libavformat/idroq.c') diff --git a/libavformat/idroq.c b/libavformat/idroq.c new file mode 100644 index 0000000000..15c6d55131 --- /dev/null +++ b/libavformat/idroq.c @@ -0,0 +1,299 @@ +/* + * Id RoQ (.roq) File Demuxer + * 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 idroq.c + * Id RoQ format file demuxer + * by Mike Melanson (melanson@pcisys.net) + * for more information on the .roq file format, visit: + * http://www.csse.monash.edu.au/~timf/ + */ + +#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 RoQ_MAGIC_NUMBER 0x1084 +#define RoQ_CHUNK_PREAMBLE_SIZE 8 +#define RoQ_AUDIO_SAMPLE_RATE 22050 +#define RoQ_CHUNKS_TO_SCAN 30 + +#define RoQ_INFO 0x1001 +#define RoQ_QUAD_CODEBOOK 0x1002 +#define RoQ_QUAD_VQ 0x1011 +#define RoQ_SOUND_MONO 0x1020 +#define RoQ_SOUND_STEREO 0x1021 + +typedef struct RoqDemuxContext { + + int width; + int height; + int audio_channels; + int framerate; + int frame_pts_inc; + + int video_stream_index; + int audio_stream_index; + + int64_t video_pts; + unsigned int audio_frame_count; + +} RoqDemuxContext; + +static int roq_probe(AVProbeData *p) +{ + if ((LE_16(&p->buf[0]) != RoQ_MAGIC_NUMBER) || + (LE_32(&p->buf[2]) != 0xFFFFFFFF)) + return 0; + + return AVPROBE_SCORE_MAX; +} + +static int roq_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + RoqDemuxContext *roq = s->priv_data; + ByteIOContext *pb = &s->pb; + AVStream *st; + unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; + int i; + unsigned int chunk_size; + unsigned int chunk_type; + + /* get the main header */ + if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != + RoQ_CHUNK_PREAMBLE_SIZE) + return AVERROR_IO; + roq->framerate = LE_16(&preamble[6]); + roq->frame_pts_inc = 90000 / roq->framerate; + + /* set the pts reference (1 pts = 1/90000) */ + s->pts_num = 1; + s->pts_den = 90000; + + /* init private context parameters */ + roq->width = roq->height = roq->audio_channels = roq->video_pts = + roq->audio_frame_count = 0; + + /* scan the first n chunks searching for A/V parameters */ + for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) { + if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != + RoQ_CHUNK_PREAMBLE_SIZE) + return AVERROR_IO; + + chunk_type = LE_16(&preamble[0]); + chunk_size = LE_32(&preamble[2]); + + switch (chunk_type) { + + case RoQ_INFO: + /* fetch the width and height; reuse the preamble bytes */ + if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != + RoQ_CHUNK_PREAMBLE_SIZE) + return AVERROR_IO; + roq->width = LE_16(&preamble[0]); + roq->height = LE_16(&preamble[2]); + break; + + case RoQ_QUAD_CODEBOOK: + case RoQ_QUAD_VQ: + /* ignore during this scan */ + url_fseek(pb, chunk_size, SEEK_CUR); + break; + + case RoQ_SOUND_MONO: + roq->audio_channels = 1; + url_fseek(pb, chunk_size, SEEK_CUR); + break; + + case RoQ_SOUND_STEREO: + roq->audio_channels = 2; + url_fseek(pb, chunk_size, SEEK_CUR); + break; + + default: + printf (" unknown RoQ chunk type (%04X)\n", LE_16(&preamble[0])); + return AVERROR_INVALIDDATA; + break; + } + + /* if all necessary parameters have been gathered, exit early */ + if ((roq->width && roq->height) && roq->audio_channels) + break; + } + + /* seek back to the first chunk */ + url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET); + + /* initialize the decoders */ + st = av_new_stream(s, 0); + if (!st) + return AVERROR_NOMEM; + roq->video_stream_index = st->index; + st->codec.codec_type = CODEC_TYPE_VIDEO; + st->codec.codec_id = CODEC_ID_ROQ; + st->codec.codec_tag = 0; /* no fourcc */ + st->codec.width = roq->width; + st->codec.height = roq->height; + + if (roq->audio_channels) { + st = av_new_stream(s, 0); + if (!st) + return AVERROR_NOMEM; + roq->audio_stream_index = st->index; + st->codec.codec_type = CODEC_TYPE_AUDIO; + st->codec.codec_id = CODEC_ID_ROQ_DPCM; + st->codec.codec_tag = 0; /* no tag */ + st->codec.channels = roq->audio_channels; + st->codec.sample_rate = RoQ_AUDIO_SAMPLE_RATE; + st->codec.bits_per_sample = 16; + st->codec.bit_rate = st->codec.channels * st->codec.sample_rate * + st->codec.bits_per_sample; + st->codec.block_align = st->codec.channels * st->codec.bits_per_sample; + } +printf (" video is %d x %d, audio is %d channels\n", + roq->width, roq->height, roq->audio_channels); + + return 0; +} + +static int roq_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + RoqDemuxContext *roq = s->priv_data; + ByteIOContext *pb = &s->pb; + int ret = 0; + unsigned int chunk_size; + unsigned int chunk_type; + unsigned int codebook_size; + unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; + int packet_read = 0; + offset_t codebook_offset; + + while (!packet_read) { + + if (url_feof(&s->pb)) + return -EIO; + + /* get the next chunk preamble */ + if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) != + RoQ_CHUNK_PREAMBLE_SIZE) + return -EIO; + + chunk_type = LE_16(&preamble[0]); + chunk_size = LE_32(&preamble[2]); + + switch (chunk_type) { + + case RoQ_INFO: + /* don't care about this chunk anymore */ + url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR); + break; + + case RoQ_QUAD_CODEBOOK: + /* packet needs to contain both this codebook and next VQ chunk */ + codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE; + codebook_size = chunk_size; + url_fseek(pb, codebook_size, SEEK_CUR); + if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != + RoQ_CHUNK_PREAMBLE_SIZE) + return -EIO; + chunk_size = LE_32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 + + codebook_size; + + /* rewind */ + url_fseek(pb, codebook_offset, SEEK_SET); + + /* load up the packet */ + if (av_new_packet(pkt, chunk_size)) + return -EIO; + pkt->stream_index = roq->video_stream_index; + pkt->pts = roq->video_pts; + ret = get_buffer(pb, pkt->data, chunk_size); + if (ret != chunk_size) + ret = -EIO; + + roq->video_pts += roq->frame_pts_inc; + packet_read = 1; + break; + + case RoQ_SOUND_MONO: + case RoQ_SOUND_STEREO: + case RoQ_QUAD_VQ: + /* load up the packet */ + if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE)) + return -EIO; + /* copy over preamble */ + memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE); + + if (chunk_type == RoQ_QUAD_VQ) { + pkt->stream_index = roq->video_stream_index; + pkt->pts = roq->video_pts; + roq->video_pts += roq->frame_pts_inc; + } else { + pkt->stream_index = roq->audio_stream_index; + pkt->pts = roq->audio_frame_count; + pkt->pts *= 90000; + pkt->pts /= RoQ_AUDIO_SAMPLE_RATE; + roq->audio_frame_count += (chunk_size / roq->audio_channels); + } + + ret = get_buffer(pb, pkt->data, chunk_size); + if (ret != chunk_size) + ret = -EIO; + + packet_read = 1; + break; + + default: + printf (" unknown RoQ chunk (%04X)\n", chunk_type); + return AVERROR_INVALIDDATA; + break; + } + } + + return ret; +} + +static int roq_read_close(AVFormatContext *s) +{ +// RoqDemuxContext *roq = (RoqDemuxContext *)s->priv_data; + + return 0; +} + +static AVInputFormat roq_iformat = { + "RoQ", + "Id RoQ format", + sizeof(RoqDemuxContext), + roq_probe, + roq_read_header, + roq_read_packet, + roq_read_close, +}; + +int roq_init(void) +{ + av_register_input_format(&roq_iformat); + return 0; +} -- cgit v1.2.3