451 lines
8.8 KiB
C
451 lines
8.8 KiB
C
/*
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* RAW encoder and decoder
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* Copyright (c) 2001 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "avformat.h"
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/* simple formats */
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int raw_write_header(struct AVFormatContext *s)
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{
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return 0;
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}
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int raw_write_packet(struct AVFormatContext *s,
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int stream_index,
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unsigned char *buf, int size)
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{
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put_buffer(&s->pb, buf, size);
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put_flush_packet(&s->pb);
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return 0;
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}
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int raw_write_trailer(struct AVFormatContext *s)
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{
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return 0;
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}
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/* raw input */
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static int raw_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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st = malloc(sizeof(AVStream));
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if (!st)
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return -1;
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s->nb_streams = 1;
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s->streams[0] = st;
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st->id = 0;
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if (ap) {
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if (s->format->audio_codec != CODEC_ID_NONE) {
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = s->format->audio_codec;
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} else if (s->format->video_codec != CODEC_ID_NONE) {
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = s->format->video_codec;
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} else {
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free(st);
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return -1;
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}
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switch(st->codec.codec_type) {
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case CODEC_TYPE_AUDIO:
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st->codec.sample_rate = ap->sample_rate;
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st->codec.channels = ap->channels;
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break;
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case CODEC_TYPE_VIDEO:
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st->codec.frame_rate = ap->frame_rate;
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st->codec.width = ap->width;
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st->codec.height = ap->height;
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break;
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default:
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return -1;
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}
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} else {
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return -1;
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}
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return 0;
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}
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/* raw input */
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static int pcm_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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st = malloc(sizeof(AVStream));
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if (!st)
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return -1;
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s->nb_streams = 1;
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s->streams[0] = st;
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st->id = 0;
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = s->format->audio_codec;
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return 0;
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}
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#define RAW_PACKET_SIZE 1024
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int raw_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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int ret;
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if (av_new_packet(pkt, RAW_PACKET_SIZE) < 0)
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return -EIO;
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pkt->stream_index = 0;
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ret = get_buffer(&s->pb, pkt->data, RAW_PACKET_SIZE);
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if (ret <= 0) {
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av_free_packet(pkt);
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return -EIO;
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}
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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return ret;
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}
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int raw_read_close(AVFormatContext *s)
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{
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return 0;
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}
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/* mp3 read */
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static int mp3_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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st = malloc(sizeof(AVStream));
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if (!st)
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return -1;
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s->nb_streams = 1;
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s->streams[0] = st;
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st->id = 0;
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = CODEC_ID_MP2;
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/* the parameters will be extracted from the compressed bitstream */
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return 0;
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}
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/* mpeg1/h263 input */
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static int video_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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st = av_mallocz(sizeof(AVStream));
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if (!st)
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return -1;
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s->nb_streams = 1;
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s->streams[0] = st;
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = s->format->video_codec;
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/* for mjpeg, specify frame rate */
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if (st->codec.codec_id == CODEC_ID_MJPEG) {
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if (ap) {
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st->codec.frame_rate = ap->frame_rate;
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} else {
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st->codec.frame_rate = 25 * FRAME_RATE_BASE;
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}
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}
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return 0;
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}
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AVFormat mp2_format = {
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"mp2",
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"MPEG audio",
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"audio/x-mpeg",
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"mp2,mp3",
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CODEC_ID_MP2,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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mp3_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat ac3_format = {
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"ac3",
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"raw ac3",
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"audio/x-ac3",
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"ac3",
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CODEC_ID_AC3,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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};
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AVFormat h263_format = {
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"h263",
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"raw h263",
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"video/x-h263",
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"h263",
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0,
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CODEC_ID_H263,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat mpeg1video_format = {
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"mpegvideo",
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"MPEG video",
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"video/x-mpeg",
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"mpg,mpeg",
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0,
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CODEC_ID_MPEG1VIDEO,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat mjpeg_format = {
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"mjpeg",
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"MJPEG video",
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"video/x-mjpeg",
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"mjpg,mjpeg",
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0,
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CODEC_ID_MJPEG,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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video_read_header,
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raw_read_packet,
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raw_read_close,
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};
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/* pcm formats */
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AVFormat pcm_s16le_format = {
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"s16le",
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"pcm signed 16 bit little endian format",
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NULL,
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#ifdef WORDS_BIGENDIAN
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"",
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#else
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"sw",
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#endif
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CODEC_ID_PCM_S16LE,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_s16be_format = {
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"s16be",
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"pcm signed 16 bit big endian format",
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NULL,
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#ifdef WORDS_BIGENDIAN
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"sw",
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#else
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"",
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#endif
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CODEC_ID_PCM_S16BE,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_u16le_format = {
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"u16le",
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"pcm unsigned 16 bit little endian format",
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NULL,
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#ifdef WORDS_BIGENDIAN
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"",
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#else
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"uw",
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#endif
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CODEC_ID_PCM_U16LE,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_u16be_format = {
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"u16be",
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"pcm unsigned 16 bit big endian format",
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NULL,
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#ifdef WORDS_BIGENDIAN
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"uw",
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#else
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"",
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#endif
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CODEC_ID_PCM_U16BE,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_s8_format = {
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"s8",
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"pcm signed 8 bit format",
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NULL,
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"sb",
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CODEC_ID_PCM_S8,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_u8_format = {
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"u8",
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"pcm unsigned 8 bit format",
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NULL,
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"ub",
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CODEC_ID_PCM_U8,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_mulaw_format = {
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"mulaw",
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"pcm mu law format",
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NULL,
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"ul",
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CODEC_ID_PCM_MULAW,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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AVFormat pcm_alaw_format = {
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"alaw",
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"pcm A law format",
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NULL,
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"al",
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CODEC_ID_PCM_ALAW,
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0,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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pcm_read_header,
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raw_read_packet,
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raw_read_close,
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};
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int rawvideo_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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int packet_size, ret, width, height;
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AVStream *st = s->streams[0];
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width = st->codec.width;
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height = st->codec.height;
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switch(st->codec.pix_fmt) {
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case PIX_FMT_YUV420P:
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packet_size = (width * height * 3) / 2;
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break;
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case PIX_FMT_YUV422:
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packet_size = (width * height * 2);
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break;
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case PIX_FMT_BGR24:
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case PIX_FMT_RGB24:
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packet_size = (width * height * 3);
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break;
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default:
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abort();
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break;
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}
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if (av_new_packet(pkt, packet_size) < 0)
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return -EIO;
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pkt->stream_index = 0;
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/* bypass buffered I/O */
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ret = url_read(url_fileno(&s->pb), pkt->data, pkt->size);
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if (ret != pkt->size) {
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av_free_packet(pkt);
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return -EIO;
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} else {
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return 0;
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}
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}
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AVFormat rawvideo_format = {
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"rawvideo",
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"raw video format",
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NULL,
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"yuv",
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CODEC_ID_NONE,
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CODEC_ID_RAWVIDEO,
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raw_write_header,
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raw_write_packet,
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raw_write_trailer,
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raw_read_header,
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rawvideo_read_packet,
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raw_read_close,
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};
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