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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <avdec_private.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <parser.h>
#define LOG_DOMAIN "mpegvideo"
/* Trivial demuxer for MPEG-1/2 video streams */
#define BUFFER_LEN 1024
#define MPEG12_SEQUENCE_HEADER
typedef struct
{
bgav_video_parser_t * parser;
int eof;
} mpegvideo_priv_t;
static int detect_type(bgav_input_context_t * input)
{
char * pos;
uint32_t header_32;
uint64_t header_64;
if(!bgav_input_get_32_be(input, &header_32))
return 0;
/* MPEG-1/2 Video */
if(header_32 == 0x000001b3)
return BGAV_MK_FOURCC('m', 'p', 'g', 'v');
else if(header_32 == 0x000001b0)
return BGAV_MK_FOURCC('C', 'A', 'V', 'S');
else if(header_32 == 0x0000010f)
return BGAV_MK_FOURCC('V', 'C', '-', '1');
/* H.264 */
if(input->filename)
{
pos = strrchr(input->filename, '.');
if(pos && !strcasecmp(pos, ".h264"))
return BGAV_MK_FOURCC('H', '2', '6', '4');
}
/* MPEG-4 */
if(!bgav_input_get_64_be(input, &header_64))
return 0;
/* Check for video_object_start_code followed by
video_object_layer_start_code */
#if 0
fprintf(stderr, "Test header: %016lx %016lx\n",
header_64, header_64 & 0xFFFFFFE0FFFFFFF0LL);
#endif
if((header_64 & 0xFFFFFFE0FFFFFFF0LL) == 0x0000010000000120LL)
return BGAV_MK_FOURCC('m', 'p', '4', 'v');
return 0;
}
static int probe_mpegvideo(bgav_input_context_t * input)
{
return detect_type(input) ? 1 : 0;
}
static int next_packet_mpegvideo(bgav_demuxer_context_t * ctx)
{
int ret;
bgav_packet_t * p;
bgav_stream_t * s;
int bytes_to_read;
s = bgav_track_get_video_stream(ctx->tt->cur, 0);
/* Sample accurate: Read data and output as many
packets as available */
if(ctx->next_packet_pos)
bytes_to_read = ctx->next_packet_pos - ctx->input->position;
else
bytes_to_read = BUFFER_LEN;
p = bgav_stream_get_packet_write(s);
bgav_packet_alloc(p, bytes_to_read);
p->position = ctx->input->position;
p->data_size = bgav_input_read_data(ctx->input, p->data,
bytes_to_read);
ret = !!p->data_size;
bgav_stream_done_packet_write(s, p);
return ret;
}
static int open_mpegvideo(bgav_demuxer_context_t * ctx)
{
mpegvideo_priv_t * priv;
bgav_stream_t * s;
priv = calloc(1, sizeof(*priv));
ctx->priv = priv;
/* Create track */
ctx->tt = bgav_track_table_create(1);
s = bgav_track_add_video_stream(ctx->tt->cur, ctx->opt);
s->index_mode = INDEX_MODE_SIMPLE;
/*
* We just set the fourcc, everything else will
* be set by the parser
*/
s->fourcc = detect_type(ctx->input);
s->flags |= (STREAM_PARSE_FULL|STREAM_RAW_PACKETS);
s->ci.flags |= GAVL_COMPRESSION_HAS_B_FRAMES;
ctx->data_start = ctx->input->position;
ctx->flags |= BGAV_DEMUXER_HAS_DATA_START;
bgav_track_set_format(ctx->tt->cur, "Elementary video stream",
"video/mpeg");
ctx->index_mode = INDEX_MODE_MIXED;
return 1;
}
static void close_mpegvideo(bgav_demuxer_context_t * ctx)
{
mpegvideo_priv_t * priv;
priv = ctx->priv;
free(priv);
}
static void resync_mpegvideo(bgav_demuxer_context_t * ctx, bgav_stream_t * s)
{
#if 0
mpegvideo_priv_t * priv;
priv = ctx->priv;
bgav_video_parser_reset(priv->parser, GAVL_TIME_UNDEFINED, STREAM_GET_SYNC(s));
// fprintf(stderr, "resync: %ld\n", s->in_time);
priv->eof = 0;
#endif
}
static int select_track_mpegvideo(bgav_demuxer_context_t * ctx, int track)
{
#if 0
mpegvideo_priv_t * priv;
priv = ctx->priv;
bgav_video_parser_reset(priv->parser, GAVL_TIME_UNDEFINED, 0);
priv->eof = 0;
#endif
return 1;
}
const bgav_demuxer_t bgav_demuxer_mpegvideo =
{
.probe = probe_mpegvideo,
.open = open_mpegvideo,
.next_packet = next_packet_mpegvideo,
// .seek = seek_mpegvideo,
.close = close_mpegvideo,
.resync = resync_mpegvideo,
.select_track = select_track_mpegvideo
};
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