mirror of
https://github.com/librempeg/librempeg
synced 2024-11-22 18:49:58 +00:00
711 lines
22 KiB
C
711 lines
22 KiB
C
/*
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* "Real" compatible mux and demux.
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* Copyright (c) 2000, 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 <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include "avformat.h"
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/* in ms */
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#define BUFFER_DURATION 0
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typedef struct {
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int nb_packets;
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int packet_total_size;
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int packet_max_size;
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/* codec related output */
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int bit_rate;
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float frame_rate;
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int nb_frames; /* current frame number */
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int total_frames; /* total number of frames */
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int num;
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AVCodecContext *enc;
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} StreamInfo;
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typedef struct {
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StreamInfo streams[2];
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StreamInfo *audio_stream, *video_stream;
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int data_pos; /* position of the data after the header */
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int nb_packets;
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} RMContext;
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static void put_str(ByteIOContext *s, const char *tag)
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{
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put_be16(s,strlen(tag));
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while (*tag) {
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put_byte(s, *tag++);
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}
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}
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static void put_str8(ByteIOContext *s, const char *tag)
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{
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put_byte(s, strlen(tag));
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while (*tag) {
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put_byte(s, *tag++);
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}
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}
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static void rv10_write_header(AVFormatContext *ctx,
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int data_size, int index_pos)
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{
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RMContext *rm = ctx->priv_data;
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ByteIOContext *s = &ctx->pb;
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StreamInfo *stream;
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unsigned char *data_offset_ptr, *start_ptr;
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const char *desc, *mimetype;
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int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
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int bit_rate, v, duration, flags, data_pos;
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start_ptr = s->buf_ptr;
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put_tag(s, ".RMF");
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put_be32(s,18); /* header size */
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put_be16(s,0);
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put_be32(s,0);
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put_be32(s,4 + ctx->nb_streams); /* num headers */
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put_tag(s,"PROP");
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put_be32(s, 50);
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put_be16(s, 0);
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packet_max_size = 0;
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packet_total_size = 0;
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nb_packets = 0;
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bit_rate = 0;
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duration = 0;
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for(i=0;i<ctx->nb_streams;i++) {
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StreamInfo *stream = &rm->streams[i];
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bit_rate += stream->bit_rate;
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if (stream->packet_max_size > packet_max_size)
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packet_max_size = stream->packet_max_size;
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nb_packets += stream->nb_packets;
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packet_total_size += stream->packet_total_size;
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/* select maximum duration */
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v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
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if (v > duration)
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duration = v;
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}
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put_be32(s, bit_rate); /* max bit rate */
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put_be32(s, bit_rate); /* avg bit rate */
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put_be32(s, packet_max_size); /* max packet size */
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if (nb_packets > 0)
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packet_avg_size = packet_total_size / nb_packets;
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else
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packet_avg_size = 0;
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put_be32(s, packet_avg_size); /* avg packet size */
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put_be32(s, nb_packets); /* num packets */
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put_be32(s, duration); /* duration */
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put_be32(s, BUFFER_DURATION); /* preroll */
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put_be32(s, index_pos); /* index offset */
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/* computation of data the data offset */
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data_offset_ptr = s->buf_ptr;
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put_be32(s, 0); /* data offset : will be patched after */
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put_be16(s, ctx->nb_streams); /* num streams */
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flags = 1 | 2; /* save allowed & perfect play */
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if (url_is_streamed(s))
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flags |= 4; /* live broadcast */
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put_be16(s, flags);
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/* comments */
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put_tag(s,"CONT");
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size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +
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strlen(ctx->comment) + 4 * 2 + 10;
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put_be32(s,size);
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put_be16(s,0);
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put_str(s, ctx->title);
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put_str(s, ctx->author);
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put_str(s, ctx->copyright);
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put_str(s, ctx->comment);
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for(i=0;i<ctx->nb_streams;i++) {
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int codec_data_size;
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stream = &rm->streams[i];
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if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
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desc = "The Audio Stream";
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mimetype = "audio/x-pn-realaudio";
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codec_data_size = 73;
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} else {
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desc = "The Video Stream";
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mimetype = "video/x-pn-realvideo";
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codec_data_size = 34;
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}
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put_tag(s,"MDPR");
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size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
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put_be32(s, size);
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put_be16(s, 0);
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put_be16(s, i); /* stream number */
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put_be32(s, stream->bit_rate); /* max bit rate */
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put_be32(s, stream->bit_rate); /* avg bit rate */
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put_be32(s, stream->packet_max_size); /* max packet size */
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if (stream->nb_packets > 0)
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packet_avg_size = stream->packet_total_size /
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stream->nb_packets;
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else
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packet_avg_size = 0;
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put_be32(s, packet_avg_size); /* avg packet size */
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put_be32(s, 0); /* start time */
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put_be32(s, BUFFER_DURATION); /* preroll */
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/* duration */
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put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
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put_str8(s, desc);
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put_str8(s, mimetype);
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put_be32(s, codec_data_size);
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if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
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int coded_frame_size, fscode, sample_rate;
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sample_rate = stream->enc->sample_rate;
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coded_frame_size = (stream->enc->bit_rate *
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stream->enc->frame_size) / (8 * sample_rate);
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/* audio codec info */
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put_tag(s, ".ra");
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put_byte(s, 0xfd);
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put_be32(s, 0x00040000); /* version */
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put_tag(s, ".ra4");
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put_be32(s, 0x01b53530); /* stream length */
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put_be16(s, 4); /* unknown */
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put_be32(s, 0x39); /* header size */
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switch(sample_rate) {
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case 48000:
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case 24000:
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case 12000:
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fscode = 1;
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break;
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default:
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case 44100:
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case 22050:
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case 11025:
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fscode = 2;
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break;
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case 32000:
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case 16000:
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case 8000:
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fscode = 3;
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}
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put_be16(s, fscode); /* codec additional info, for AC3, seems
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to be a frequency code */
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/* special hack to compensate rounding errors... */
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if (coded_frame_size == 557)
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coded_frame_size--;
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put_be32(s, coded_frame_size); /* frame length */
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put_be32(s, 0x51540); /* unknown */
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put_be32(s, 0x249f0); /* unknown */
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put_be32(s, 0x249f0); /* unknown */
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put_be16(s, 0x01);
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/* frame length : seems to be very important */
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put_be16(s, coded_frame_size);
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put_be32(s, 0); /* unknown */
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put_be16(s, stream->enc->sample_rate); /* sample rate */
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put_be32(s, 0x10); /* unknown */
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put_be16(s, stream->enc->channels);
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put_str8(s, "Int0"); /* codec name */
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put_str8(s, "dnet"); /* codec name */
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put_be16(s, 0); /* title length */
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put_be16(s, 0); /* author length */
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put_be16(s, 0); /* copyright length */
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put_byte(s, 0); /* end of header */
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} else {
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/* video codec info */
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put_be32(s,34); /* size */
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put_tag(s,"VIDORV10");
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put_be16(s, stream->enc->width);
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put_be16(s, stream->enc->height);
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put_be16(s, 24); /* frames per seconds ? */
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put_be32(s,0); /* unknown meaning */
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put_be16(s, 12); /* unknown meaning */
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put_be32(s,0); /* unknown meaning */
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put_be16(s, 8); /* unknown meaning */
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/* Seems to be the codec version: only use basic H263. The next
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versions seems to add a diffential DC coding as in
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MPEG... nothing new under the sun */
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put_be32(s,0x10000000);
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//put_be32(s,0x10003000);
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}
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}
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/* patch data offset field */
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data_pos = s->buf_ptr - start_ptr;
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rm->data_pos = data_pos;
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data_offset_ptr[0] = data_pos >> 24;
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data_offset_ptr[1] = data_pos >> 16;
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data_offset_ptr[2] = data_pos >> 8;
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data_offset_ptr[3] = data_pos;
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/* data stream */
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put_tag(s,"DATA");
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put_be32(s,data_size + 10 + 8);
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put_be16(s,0);
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put_be32(s, nb_packets); /* number of packets */
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put_be32(s,0); /* next data header */
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}
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static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
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int length, int key_frame)
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{
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int timestamp;
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ByteIOContext *s = &ctx->pb;
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stream->nb_packets++;
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stream->packet_total_size += length;
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if (length > stream->packet_max_size)
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stream->packet_max_size = length;
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put_be16(s,0); /* version */
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put_be16(s,length + 12);
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put_be16(s, stream->num); /* stream number */
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timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
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put_be32(s, timestamp); /* timestamp */
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put_byte(s, 0); /* reserved */
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put_byte(s, key_frame ? 2 : 0); /* flags */
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}
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static int rm_write_header(AVFormatContext *s)
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{
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StreamInfo *stream;
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RMContext *rm;
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int n;
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AVCodecContext *codec;
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rm = malloc(sizeof(RMContext));
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if (!rm)
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return -1;
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memset(rm, 0, sizeof(RMContext));
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s->priv_data = rm;
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for(n=0;n<s->nb_streams;n++) {
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s->streams[n]->id = n;
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codec = &s->streams[n]->codec;
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stream = &rm->streams[n];
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memset(stream, 0, sizeof(StreamInfo));
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stream->num = n;
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stream->bit_rate = codec->bit_rate;
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stream->enc = codec;
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switch(codec->codec_type) {
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case CODEC_TYPE_AUDIO:
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rm->audio_stream = stream;
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stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
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/* XXX: dummy values */
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stream->packet_max_size = 1024;
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stream->nb_packets = 0;
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stream->total_frames = stream->nb_packets;
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break;
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case CODEC_TYPE_VIDEO:
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rm->video_stream = stream;
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stream->frame_rate = (float)codec->frame_rate / (float)FRAME_RATE_BASE;
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/* XXX: dummy values */
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stream->packet_max_size = 4096;
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stream->nb_packets = 0;
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stream->total_frames = stream->nb_packets;
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break;
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}
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}
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rv10_write_header(s, 0, 0);
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put_flush_packet(&s->pb);
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return 0;
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}
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static int rm_write_audio(AVFormatContext *s, UINT8 *buf, int size)
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{
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UINT8 buf1[size];
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RMContext *rm = s->priv_data;
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ByteIOContext *pb = &s->pb;
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StreamInfo *stream = rm->audio_stream;
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int i;
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write_packet_header(s, stream, size, stream->enc->key_frame);
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/* for AC3, the words seems to be reversed */
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for(i=0;i<size;i+=2) {
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buf1[i] = buf[i+1];
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buf1[i+1] = buf[i];
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}
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put_buffer(pb, buf1, size);
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put_flush_packet(pb);
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stream->nb_frames++;
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return 0;
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}
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static int rm_write_video(AVFormatContext *s, UINT8 *buf, int size)
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{
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RMContext *rm = s->priv_data;
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ByteIOContext *pb = &s->pb;
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StreamInfo *stream = rm->video_stream;
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int key_frame = stream->enc->key_frame;
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/* XXX: this is incorrect: should be a parameter */
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/* Well, I spent some time finding the meaning of these bits. I am
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not sure I understood everything, but it works !! */
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#if 1
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write_packet_header(s, stream, size + 7, key_frame);
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/* bit 7: '1' if final packet of a frame converted in several packets */
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put_byte(pb, 0x81);
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/* bit 7: '1' if I frame. bits 6..0 : sequence number in current
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frame starting from 1 */
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if (key_frame) {
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put_byte(pb, 0x81);
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} else {
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put_byte(pb, 0x01);
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}
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put_be16(pb, 0x4000 | (size)); /* total frame size */
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put_be16(pb, 0x4000 | (size)); /* offset from the start or the end */
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#else
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/* full frame */
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write_packet_header(s, size + 6);
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put_byte(pb, 0xc0);
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put_be16(pb, 0x4000 | size); /* total frame size */
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put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
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#endif
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put_byte(pb, stream->nb_frames & 0xff);
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put_buffer(pb, buf, size);
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put_flush_packet(pb);
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stream->nb_frames++;
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return 0;
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}
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static int rm_write_packet(AVFormatContext *s, int stream_index,
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UINT8 *buf, int size)
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{
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if (s->streams[stream_index]->codec.codec_type ==
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CODEC_TYPE_AUDIO)
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return rm_write_audio(s, buf, size);
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else
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return rm_write_video(s, buf, size);
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}
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static int rm_write_trailer(AVFormatContext *s)
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{
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RMContext *rm = s->priv_data;
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int data_size, index_pos, i;
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ByteIOContext *pb = &s->pb;
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if (!url_is_streamed(&s->pb)) {
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/* end of file: finish to write header */
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index_pos = url_fseek(pb, 0, SEEK_CUR);
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data_size = index_pos - rm->data_pos;
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/* index */
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put_tag(pb, "INDX");
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put_be32(pb, 10 + 10 * s->nb_streams);
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put_be16(pb, 0);
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for(i=0;i<s->nb_streams;i++) {
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put_be32(pb, 0); /* zero indices */
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put_be16(pb, i); /* stream number */
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put_be32(pb, 0); /* next index */
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}
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/* undocumented end header */
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put_be32(pb, 0);
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put_be32(pb, 0);
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url_fseek(pb, 0, SEEK_SET);
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for(i=0;i<s->nb_streams;i++)
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rm->streams[i].total_frames = rm->streams[i].nb_frames;
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rv10_write_header(s, data_size, index_pos);
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} else {
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/* undocumented end header */
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put_be32(pb, 0);
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put_be32(pb, 0);
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}
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put_flush_packet(pb);
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free(rm);
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return 0;
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}
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/***************************************************/
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static void get_str(ByteIOContext *pb, char *buf, int buf_size)
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{
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int len, i;
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char *q;
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len = get_be16(pb);
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q = buf;
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for(i=0;i<len;i++) {
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if (i < buf_size - 1)
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*q++ = get_byte(pb);
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}
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*q = '\0';
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}
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static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
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{
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int len, i;
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char *q;
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len = get_byte(pb);
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q = buf;
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for(i=0;i<len;i++) {
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if (i < buf_size - 1)
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*q++ = get_byte(pb);
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}
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*q = '\0';
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}
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static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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RMContext *rm;
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AVStream *st;
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ByteIOContext *pb = &s->pb;
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unsigned int tag, v;
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int tag_size, size, codec_data_size, i;
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INT64 codec_pos;
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unsigned int h263_hack_version;
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char buf[128];
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if (get_le32(pb) != MKTAG('.', 'R', 'M', 'F'))
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return -EIO;
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rm = av_mallocz(sizeof(RMContext));
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if (!rm)
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return -ENOMEM;
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s->priv_data = rm;
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get_be32(pb); /* header size */
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get_be16(pb);
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get_be32(pb);
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get_be32(pb); /* number of headers */
|
|
|
|
for(;;) {
|
|
if (url_feof(pb))
|
|
goto fail;
|
|
tag = get_le32(pb);
|
|
tag_size = get_be32(pb);
|
|
get_be16(pb);
|
|
#if 0
|
|
printf("tag=%c%c%c%c (%08x) size=%d\n",
|
|
(tag) & 0xff,
|
|
(tag >> 8) & 0xff,
|
|
(tag >> 16) & 0xff,
|
|
(tag >> 24) & 0xff,
|
|
tag,
|
|
tag_size);
|
|
#endif
|
|
if (tag_size < 10)
|
|
goto fail;
|
|
switch(tag) {
|
|
case MKTAG('P', 'R', 'O', 'P'):
|
|
/* file header */
|
|
get_be32(pb); /* max bit rate */
|
|
get_be32(pb); /* avg bit rate */
|
|
get_be32(pb); /* max packet size */
|
|
get_be32(pb); /* avg packet size */
|
|
get_be32(pb); /* nb packets */
|
|
get_be32(pb); /* duration */
|
|
get_be32(pb); /* preroll */
|
|
get_be32(pb); /* index offset */
|
|
get_be32(pb); /* data offset */
|
|
get_be16(pb); /* nb streams */
|
|
get_be16(pb); /* flags */
|
|
break;
|
|
case MKTAG('C', 'O', 'N', 'T'):
|
|
get_str(pb, s->title, sizeof(s->title));
|
|
get_str(pb, s->author, sizeof(s->author));
|
|
get_str(pb, s->copyright, sizeof(s->copyright));
|
|
get_str(pb, s->comment, sizeof(s->comment));
|
|
break;
|
|
case MKTAG('M', 'D', 'P', 'R'):
|
|
st = av_mallocz(sizeof(AVStream));
|
|
if (!st)
|
|
goto fail;
|
|
s->streams[s->nb_streams++] = st;
|
|
st->id = get_be16(pb);
|
|
get_be32(pb); /* max bit rate */
|
|
st->codec.bit_rate = get_be32(pb); /* bit rate */
|
|
get_be32(pb); /* max packet size */
|
|
get_be32(pb); /* avg packet size */
|
|
get_be32(pb); /* start time */
|
|
get_be32(pb); /* preroll */
|
|
get_be32(pb); /* duration */
|
|
get_str8(pb, buf, sizeof(buf)); /* desc */
|
|
get_str8(pb, buf, sizeof(buf)); /* mimetype */
|
|
codec_data_size = get_be32(pb);
|
|
codec_pos = url_ftell(pb);
|
|
|
|
v = get_be32(pb);
|
|
if (v == MKTAG(0xfd, 'a', 'r', '.')) {
|
|
/* ra type header */
|
|
get_be32(pb); /* version */
|
|
get_be32(pb); /* .ra4 */
|
|
get_be32(pb);
|
|
get_be16(pb);
|
|
get_be32(pb); /* header size */
|
|
get_be16(pb); /* add codec info */
|
|
get_be32(pb); /* coded frame size */
|
|
get_be32(pb); /* ??? */
|
|
get_be32(pb); /* ??? */
|
|
get_be32(pb); /* ??? */
|
|
get_be16(pb); /* 1 */
|
|
get_be16(pb); /* coded frame size */
|
|
get_be32(pb);
|
|
st->codec.sample_rate = get_be16(pb);
|
|
get_be32(pb);
|
|
st->codec.channels = get_be16(pb);
|
|
get_str8(pb, buf, sizeof(buf)); /* desc */
|
|
get_str8(pb, buf, sizeof(buf)); /* desc */
|
|
st->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
if (!strcmp(buf, "dnet")) {
|
|
st->codec.codec_id = CODEC_ID_AC3;
|
|
} else {
|
|
st->codec.codec_id = CODEC_ID_NONE;
|
|
nstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
|
|
buf);
|
|
}
|
|
} else {
|
|
if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
|
|
fail1:
|
|
fprintf(stderr, "Unsupported video codec\n");
|
|
goto fail;
|
|
}
|
|
st->codec.codec_tag = get_le32(pb);
|
|
if (st->codec.codec_tag != MKTAG('R', 'V', '1', '0'))
|
|
goto fail1;
|
|
st->codec.width = get_be16(pb);
|
|
st->codec.height = get_be16(pb);
|
|
st->codec.frame_rate = get_be16(pb) * FRAME_RATE_BASE;
|
|
st->codec.codec_type = CODEC_TYPE_VIDEO;
|
|
get_be32(pb);
|
|
get_be16(pb);
|
|
get_be32(pb);
|
|
get_be16(pb);
|
|
/* modification of h263 codec version (!) */
|
|
h263_hack_version = get_be32(pb);
|
|
switch(h263_hack_version) {
|
|
case 0x10000000:
|
|
st->codec.sub_id = 0;
|
|
st->codec.codec_id = CODEC_ID_RV10;
|
|
break;
|
|
case 0x10003000:
|
|
case 0x10003001:
|
|
st->codec.sub_id = 3;
|
|
st->codec.codec_id = CODEC_ID_RV10;
|
|
break;
|
|
default:
|
|
/* not handled */
|
|
st->codec.codec_id = CODEC_ID_NONE;
|
|
break;
|
|
}
|
|
}
|
|
/* skip codec info */
|
|
size = url_ftell(pb) - codec_pos;
|
|
url_fskip(pb, codec_data_size - size);
|
|
break;
|
|
case MKTAG('D', 'A', 'T', 'A'):
|
|
goto header_end;
|
|
default:
|
|
/* unknown tag: skip it */
|
|
url_fskip(pb, tag_size - 10);
|
|
break;
|
|
}
|
|
}
|
|
header_end:
|
|
rm->nb_packets = get_be32(pb); /* number of packets */
|
|
get_be32(pb); /* next data header */
|
|
return 0;
|
|
|
|
fail:
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
free(s->streams[i]);
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
RMContext *rm = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
AVStream *st;
|
|
int len, num, timestamp, i, tmp, j;
|
|
UINT8 *ptr;
|
|
|
|
redo:
|
|
if (rm->nb_packets == 0)
|
|
return -EIO;
|
|
get_be16(pb);
|
|
len = get_be16(pb);
|
|
if (len < 12)
|
|
return -EIO;
|
|
num = get_be16(pb);
|
|
timestamp = get_be32(pb);
|
|
get_byte(pb); /* reserved */
|
|
get_byte(pb); /* flags */
|
|
rm->nb_packets--;
|
|
len -= 12;
|
|
|
|
st = NULL;
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
st = s->streams[i];
|
|
if (num == st->id)
|
|
break;
|
|
}
|
|
if (i == s->nb_streams) {
|
|
/* skip packet if unknown number */
|
|
url_fskip(pb, len);
|
|
goto redo;
|
|
}
|
|
|
|
av_new_packet(pkt, len);
|
|
pkt->stream_index = i;
|
|
get_buffer(pb, pkt->data, len);
|
|
/* for AC3, needs to swap bytes */
|
|
if (st->codec.codec_id == CODEC_ID_AC3) {
|
|
ptr = pkt->data;
|
|
for(j=0;j<len;j+=2) {
|
|
tmp = ptr[0];
|
|
ptr[0] = ptr[1];
|
|
ptr[1] = tmp;
|
|
ptr += 2;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rm_read_close(AVFormatContext *s)
|
|
{
|
|
RMContext *rm = s->priv_data;
|
|
free(rm);
|
|
return 0;
|
|
}
|
|
|
|
AVFormat rm_format = {
|
|
"rm",
|
|
"rm format",
|
|
"audio/x-pn-realaudio",
|
|
"rm,ra",
|
|
CODEC_ID_AC3,
|
|
CODEC_ID_RV10,
|
|
rm_write_header,
|
|
rm_write_packet,
|
|
rm_write_trailer,
|
|
|
|
rm_read_header,
|
|
rm_read_packet,
|
|
rm_read_close,
|
|
};
|