mirror of https://github.com/mpv-player/mpv
516 lines
13 KiB
C
516 lines
13 KiB
C
/*
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Real parser & demuxer
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(C) Alex Beregszaszi <alex@naxine.org>
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Based on FFmpeg's libav/rm.c.
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*/
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/*
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Some codecs for Real (from Mike Melanson):
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RV10: As has been mentioned, H.263-based; not an unreasonable guess
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RV20: RealVideo 2.0, nothing known
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RV30: RealVideo 3.0,nothing known, but I don't believe I've ever seen any
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media encoded with it
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DNET: apparently one of their original audio codecs, to be used with music
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SIPR: SiprNet, based on ACELP, and is great for compressing voice
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COKR(?): Cooker, the fabled G2 audio codec
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New infos:
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Audio codecs: (supported by RealPlayer8 for Linux)
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ATRC - RealAudio 8 (ATRAC3)
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COOK - RealAudio G2
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DNET - RealAudio 3.0
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SIPR - SiproLab's audio codec
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Video codecs: (supported by RealPlayer8 for Linux)
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RV10
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RV20
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RV30
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "help_mp.h"
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#include "stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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#include "bswap.h"
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#define MKTAG(a, b, c, d) (a | (b << 8) | (c << 16) | (d << 24))
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#define MAX_STREAMS 10
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typedef struct {
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int data_chunk_offset; /* i think for seeking */
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int num_of_packets;
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int last_a_stream;
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int a_streams[MAX_STREAMS];
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int last_v_stream;
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int v_streams[MAX_STREAMS];
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} real_priv_t;
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static void get_str(int isbyte, demuxer_t *demuxer, 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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if (isbyte)
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len = stream_read_char(demuxer->stream);
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else
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len = stream_read_word(demuxer->stream);
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#if 1
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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++ = stream_read_char(demuxer->stream);
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*q = 0;
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#else
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stream_read(demuxer->stream, buf, buf_size);
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#endif
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}
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static void skip_str(int isbyte, demuxer_t *demuxer)
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{
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int len;
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if (isbyte)
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len = stream_read_char(demuxer->stream);
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else
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len = stream_read_word(demuxer->stream);
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stream_skip(demuxer->stream, len);
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printf("skip_str: %d bytes skipped\n", len);
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}
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int real_check_file(demuxer_t* demuxer)
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{
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real_priv_t *priv;
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int c;
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mp_msg(MSGT_DEMUX,MSGL_V,"Checking for REAL\n");
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c = stream_read_dword_le(demuxer->stream);
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if (c == -256)
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return 0; /* EOF */
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if (c != MKTAG('.', 'R', 'M', 'F'))
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return 0; /* bad magic */
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priv = malloc(sizeof(real_priv_t));
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memset(priv, 0, sizeof(real_priv_t));
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demuxer->priv = priv;
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return 1;
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}
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// return value:
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// 0 = EOF or no stream found
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// 1 = successfully read a packet
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int demux_real_fill_buffer(demuxer_t *demuxer)
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{
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real_priv_t *priv = demuxer->priv;
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demux_stream_t *ds = NULL;
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int len;
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int timestamp;
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int stream_id;
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int i;
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int flags;
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// printf("num_of_packets: %d\n", priv->num_of_packets);
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loop:
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if (priv->num_of_packets == 0)
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return 0; /* EOF */
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stream_skip(demuxer->stream, 2); /* version */
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len = stream_read_word(demuxer->stream);
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if (len == -256) /* EOF */
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return 0;
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if (len < 12)
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{
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printf("bad packet len (%d)\n", len);
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stream_skip(demuxer->stream, len);
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goto loop;
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}
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stream_id = stream_read_word(demuxer->stream);
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timestamp = stream_read_dword(demuxer->stream);
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stream_skip(demuxer->stream, 1); /* reserved */
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flags = stream_read_char(demuxer->stream);
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/* flags: */
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/* 0x2 - keyframe */
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printf("packet#%d: len: %d, stream_id: %d, timestamp: %d, flags: %x\n",
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priv->num_of_packets, len, stream_id, timestamp, flags);
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priv->num_of_packets--;
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len -= 12;
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/* check if stream_id is audio stream */
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for (i = 0; i < priv->last_a_stream; i++)
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{
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if (priv->a_streams[i] == stream_id)
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{
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// printf("packet is audio (id: %d)\n", stream_id);
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ds = demuxer->audio; /* FIXME */
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break;
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}
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}
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/* check if stream_id is video stream */
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for (i = 0; i < priv->last_v_stream; i++)
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{
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if (priv->v_streams[i] == stream_id)
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{
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// printf("packet is video (id: %d)\n", stream_id);
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ds = demuxer->video; /* FIXME */
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break;
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}
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}
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/* id not found */
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if (ds == NULL)
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{
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printf("unknown stream id (%d)\n", stream_id);
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stream_skip(demuxer->stream, len);
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goto loop;
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}
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demuxer->filepos = stream_tell(demuxer->stream);
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ds_read_packet(ds, demuxer->stream, len, timestamp/90000.0f,
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demuxer->filepos, (flags & 0x2) ? 0x10 : 0);
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return 1;
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}
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void demux_open_real(demuxer_t* demuxer)
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{
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real_priv_t* priv = demuxer->priv;
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int num_of_headers;
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int i;
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stream_skip(demuxer->stream, 4); /* header size */
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stream_skip(demuxer->stream, 2);
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stream_skip(demuxer->stream, 4);
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num_of_headers = stream_read_dword(demuxer->stream);
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// stream_skip(demuxer->stream, 4); /* number of headers */
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/* parse chunks */
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for (i = 1; i < num_of_headers; i++)
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{
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int chunk, chunk_size;
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chunk = stream_read_dword_le(demuxer->stream);
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chunk_size = stream_read_dword(demuxer->stream);
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stream_skip(demuxer->stream, 2);
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if (chunk_size < 10)
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goto fail;
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printf("Chunk: %.4s (size: %d)\n",
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(char *)&chunk, chunk_size);
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switch(chunk)
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{
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case MKTAG('P', 'R', 'O', 'P'):
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// printf("Properties chunk\n");
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stream_skip(demuxer->stream, 4); /* max bitrate */
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stream_skip(demuxer->stream, 4); /* avg bitrate */
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stream_skip(demuxer->stream, 4); /* max packet size */
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stream_skip(demuxer->stream, 4); /* avg packet size */
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stream_skip(demuxer->stream, 4); /* nb packets */
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stream_skip(demuxer->stream, 4); /* duration */
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stream_skip(demuxer->stream, 4); /* preroll */
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stream_skip(demuxer->stream, 4); /* index offset */
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// stream_skip(demuxer->stream, 4); /* data offset */
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priv->data_chunk_offset = stream_read_dword(demuxer->stream)+10;
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printf("Data chunk offset: 0x%x\n", priv->data_chunk_offset);
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stream_skip(demuxer->stream, 2); /* nb streams */
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#if 0
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stream_skip(demuxer->stream, 2); /* flags */
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#else
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{
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int flags = stream_read_word(demuxer->stream);
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printf("Flags (%x): ", flags);
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if (flags & 0x1)
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printf("[save allowed] ");
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if (flags & 0x2)
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printf("[perfect play (?)] ");
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if (flags & 0x4)
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printf("[live broadcast] ");
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printf("\n");
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}
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#endif
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break;
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case MKTAG('C', 'O', 'N', 'T'):
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{
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char *buf;
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int len;
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// printf("Broadcasting informations (title, author, copyright, comment)\n");
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len = stream_read_word(demuxer->stream);
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if (len > 0)
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{
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buf = malloc(len+1);
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stream_read(demuxer->stream, buf, len);
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demux_info_add(demuxer, "name", buf);
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free(buf);
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}
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len = stream_read_word(demuxer->stream);
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if (len > 0)
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{
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buf = malloc(len+1);
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stream_read(demuxer->stream, buf, len);
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demux_info_add(demuxer, "author", buf);
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free(buf);
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}
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len = stream_read_word(demuxer->stream);
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if (len > 0)
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{
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buf = malloc(len+1);
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stream_read(demuxer->stream, buf, len);
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demux_info_add(demuxer, "copyright", buf);
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free(buf);
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}
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len = stream_read_word(demuxer->stream);
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if (len > 0)
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{
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buf = malloc(len+1);
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stream_read(demuxer->stream, buf, len);
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demux_info_add(demuxer, "comment", buf);
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free(buf);
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}
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// skip_str(0, demuxer); /* title */
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// skip_str(0, demuxer); /* author */
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// skip_str(0, demuxer); /* copyright */
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// skip_str(0, demuxer); /* comment */
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break;
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}
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case MKTAG('M', 'D', 'P', 'R'):
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{
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/* new stream */
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int stream_id;
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int bitrate;
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int codec_data_size;
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int codec_pos;
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int tmp;
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stream_id = stream_read_word(demuxer->stream);
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printf("Found new stream (id: %d)\n", stream_id);
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stream_skip(demuxer->stream, 4); /* max bitrate */
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bitrate = stream_read_dword(demuxer->stream); /* bitrate */
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stream_skip(demuxer->stream, 4); /* max packet size */
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stream_skip(demuxer->stream, 4); /* avg packet size */
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stream_skip(demuxer->stream, 4); /* start time */
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stream_skip(demuxer->stream, 4); /* preroll */
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stream_skip(demuxer->stream, 4); /* duration */
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skip_str(1, demuxer); /* stream description */
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skip_str(1, demuxer); /* mimetype */
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codec_data_size = stream_read_dword(demuxer->stream);
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codec_pos = stream_tell(demuxer->stream);
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tmp = stream_read_dword(demuxer->stream);
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if (tmp == MKTAG(0xfd, 'a', 'r', '.')) /* audio header */
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{
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sh_audio_t *sh = new_sh_audio(demuxer, stream_id);
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char buf[128]; /* for codec name */
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int frame_size;
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printf("Found audio stream!\n");
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stream_skip(demuxer->stream, 2); /* version (4 or 5) */
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stream_skip(demuxer->stream, 2);
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stream_skip(demuxer->stream, 4); /* .ra4 or .ra5 */
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stream_skip(demuxer->stream, 4);
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stream_skip(demuxer->stream, 2); /* version (4 or 5) */
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stream_skip(demuxer->stream, 4); /* header size */
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stream_skip(demuxer->stream, 2); /* add codec info */
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stream_skip(demuxer->stream, 4); /* coded frame size */
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stream_skip(demuxer->stream, 4);
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stream_skip(demuxer->stream, 4);
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stream_skip(demuxer->stream, 4);
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stream_skip(demuxer->stream, 2); /* 1 */
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// stream_skip(demuxer->stream, 2); /* coded frame size */
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frame_size = stream_read_word(demuxer->stream);
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printf("frame_size: %d\n", frame_size);
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stream_skip(demuxer->stream, 4);
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sh->samplerate = stream_read_word(demuxer->stream);
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stream_skip(demuxer->stream, 4);
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sh->channels = stream_read_word(demuxer->stream);
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/* Desc #1 */
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skip_str(1, demuxer);
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/* Desc #2 */
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get_str(1, demuxer, buf, sizeof(buf));
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tmp = 1; /* supported audio codec */
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switch (MKTAG(buf[0], buf[1], buf[2], buf[3]))
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{
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case MKTAG('a', 't', 'r', 'c'):
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break;
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case MKTAG('d', 'n', 'e', 't'):
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printf("Audio: DNET -> AC3\n");
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sh->format = 0x2000;
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break;
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case MKTAG('s', 'i', 'p', 'r'):
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printf("Audio: SiproLab's ACELP.net\n");
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sh->format = 0x130;
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break;
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case MKTAG('c', 'o', 'o', 'k'):
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printf("Audio: Real's GeneralCooker (unsupported)\n");
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tmp = 0;
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break;
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default:
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printf("Audio: Unknown (%s)\n", buf);
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tmp = 0;
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sh->format = MKTAG(buf[0], buf[1], buf[2], buf[3]);
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}
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if (tmp)
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{
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/* Emulate WAVEFORMATEX struct: */
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sh->wf = malloc(sizeof(WAVEFORMATEX));
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memset(sh->wf, 0, sizeof(WAVEFORMATEX));
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sh->wf->wFormatTag = sh->format;
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sh->wf->nChannels = sh->channels;
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sh->wf->wBitsPerSample = 16;
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sh->wf->nSamplesPerSec = sh->samplerate;
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sh->wf->nAvgBytesPerSec = bitrate;
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sh->wf->nBlockAlign = frame_size; /* 19 for acelp, pff */
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sh->wf->cbSize = 0;
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/* insert as stream */
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demuxer->audio->sh = sh;
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sh->ds = demuxer->audio;
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demuxer->audio->id = stream_id;
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if (priv->last_a_stream+1 < MAX_STREAMS)
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{
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priv->a_streams[priv->last_a_stream] = stream_id;
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priv->last_a_stream++;
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}
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}
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}
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else
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{
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/* video header */
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sh_video_t *sh = new_sh_video(demuxer, stream_id);
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tmp = stream_read_dword_le(demuxer->stream);
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printf("video: %.4s (%x)\n", (char *)&tmp, tmp);
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if (tmp != MKTAG('V', 'I', 'D', 'O'))
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{
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mp_msg(MSGT_DEMUX, MSGL_ERR, "Unsupported video codec\n");
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goto skip_this_chunk;
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}
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sh->format = stream_read_dword_le(demuxer->stream); /* fourcc */
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printf("video fourcc: %.4s (%x)\n", (char *)&sh->format, sh->format);
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/* emulate BITMAPINFOHEADER */
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sh->bih = malloc(sizeof(BITMAPINFOHEADER));
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memset(sh->bih, 0, sizeof(BITMAPINFOHEADER));
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sh->bih->biSize = 40;
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sh->disp_w = sh->bih->biWidth = stream_read_word(demuxer->stream);
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sh->disp_h = sh->bih->biHeight = stream_read_word(demuxer->stream);
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sh->bih->biPlanes = 1;
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sh->bih->biBitCount = 24;
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sh->bih->biCompression = sh->format;
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sh->bih->biSizeImage= sh->bih->biWidth*sh->bih->biHeight*3;
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sh->fps = stream_read_word(demuxer->stream);
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sh->frametime = 1.0f/sh->fps;
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stream_skip(demuxer->stream, 4);
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stream_skip(demuxer->stream, 2);
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stream_skip(demuxer->stream, 4);
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stream_skip(demuxer->stream, 2);
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/* h263 hack */
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tmp = stream_read_dword(demuxer->stream);
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switch (tmp)
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{
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case 0x10000000:
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/* sub id: 0 */
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/* codec id: rv10 */
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break;
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case 0x10003000:
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case 0x10003001:
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/* sub id: 3 */
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/* codec id: rv10 */
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break;
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case 0x20001000:
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case 0x20100001:
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/* codec id: rv20 */
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break;
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default:
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/* codec id: none */
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printf("unknown id: %x\n", tmp);
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}
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/* insert as stream */
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demuxer->video->sh = sh;
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sh->ds = demuxer->video;
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demuxer->video->id = stream_id;
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if (priv->last_v_stream+1 < MAX_STREAMS)
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{
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priv->v_streams[priv->last_v_stream] = stream_id;
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priv->last_v_stream++;
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}
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}
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skip_this_chunk:
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/* skip codec info */
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tmp = stream_tell(demuxer->stream) - codec_pos;
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stream_skip(demuxer->stream, codec_data_size - tmp);
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break;
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}
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case MKTAG('D', 'A', 'T', 'A'):
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goto header_end;
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case MKTAG('I', 'N', 'D', 'X'):
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default:
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printf("Unknown chunk: %x\n", chunk);
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stream_skip(demuxer->stream, chunk_size - 10);
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break;
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}
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}
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header_end:
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priv->num_of_packets = stream_read_dword(demuxer->stream);
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// stream_skip(demuxer->stream, 4); /* number of packets */
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stream_skip(demuxer->stream, 4); /* next data header */
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printf("Packets in file: %d\n", priv->num_of_packets);
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/* disable seeking */
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demuxer->seekable = 0;
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fail:
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return;
|
|
}
|
|
|
|
void demux_close_real(demuxer_t *demuxer)
|
|
{
|
|
real_priv_t* priv = demuxer->priv;
|
|
|
|
if (priv)
|
|
free(priv);
|
|
|
|
return;
|
|
}
|