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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 <string.h>
#define AUDIO_ID 0
#define VIDEO_ID 1
static const uint8_t signature[8] = { 0x00, 0x0a, 'S', 'M','J','P','E','G' };
static int probe_smjpeg(bgav_input_context_t * input)
{
uint8_t probe_data[8];
if(bgav_input_get_data(input, probe_data, 8) < 8)
return 0;
if(!memcmp(probe_data, signature, 8))
return 1;
else
return 0;
}
static int open_smjpeg(bgav_demuxer_context_t * ctx)
{
int done = 0;
uint32_t tmp_32;
uint16_t tmp_16;
uint8_t tmp_8;
uint32_t fourcc, length;
bgav_stream_t * s;
/* Skip signature and version */
bgav_input_skip(ctx->input, 12);
/* Create track table */
ctx->tt = bgav_track_table_create(1);
/* Duration in milliseconds */
if(!bgav_input_read_32_be(ctx->input, &tmp_32))
return 0;
gavl_track_set_duration(ctx->tt->cur->info, gavl_time_unscale(1000, tmp_32));
while(!done)
{
if(!bgav_input_read_fourcc(ctx->input, &fourcc))
return 0;
switch(fourcc)
{
case BGAV_MK_FOURCC('_','T','X','T'):
if(!bgav_input_read_32_be(ctx->input, &length))
return 0;
bgav_input_skip(ctx->input, length);
break;
case BGAV_MK_FOURCC('_','S','N','D'):
if(!bgav_input_read_32_be(ctx->input, &length))
return 0;
s = bgav_track_add_audio_stream(ctx->tt->cur, ctx->opt);
s->stream_id = AUDIO_ID;
s->timescale = 1000;
if(!bgav_input_read_16_be(ctx->input, &tmp_16))
return 0;
s->data.audio.format->samplerate = tmp_16;
if(!bgav_input_read_data(ctx->input, &tmp_8, 1))
return 0;
s->data.audio.bits_per_sample = tmp_8;
if(!bgav_input_read_data(ctx->input, &tmp_8, 1))
return 0;
s->data.audio.format->num_channels = tmp_8;
if(!bgav_input_read_fourcc(ctx->input, &fourcc))
return 0;
if(fourcc == BGAV_MK_FOURCC('N','O','N','E'))
s->fourcc = BGAV_WAVID_2_FOURCC(0x0001);
else if(fourcc == BGAV_MK_FOURCC('A','P','C','M'))
s->fourcc = BGAV_MK_FOURCC('S','M','J','A');
if(length > 8)
bgav_input_skip(ctx->input, length - 8);
break;
case BGAV_MK_FOURCC('_','V','I','D'):
if(!bgav_input_read_32_be(ctx->input, &length))
return 0;
s = bgav_track_add_video_stream(ctx->tt->cur, ctx->opt);
s->stream_id = VIDEO_ID;
bgav_input_skip(ctx->input, 4); // Number of frames
if(!bgav_input_read_16_be(ctx->input, &tmp_16))
return 0;
s->data.video.format->image_width = tmp_16;
s->data.video.format->frame_width = tmp_16;
if(!bgav_input_read_16_be(ctx->input, &tmp_16))
return 0;
s->data.video.format->image_height = tmp_16;
s->data.video.format->frame_height = tmp_16;
s->data.video.format->pixel_width = 1;
s->data.video.format->pixel_height = 1;
s->data.video.format->timescale = 1000;
s->data.video.format->framerate_mode = GAVL_FRAMERATE_VARIABLE;
s->flags |= STREAM_NO_DURATIONS;
if(!bgav_input_read_fourcc(ctx->input, &fourcc))
return 0;
s->fourcc = fourcc;
if(length > 12)
bgav_input_skip(ctx->input, length - 12);
break;
case BGAV_MK_FOURCC('H','E','N','D'):
done = 1;
break;
}
}
ctx->data_start = ctx->input->position;
ctx->flags |= BGAV_DEMUXER_HAS_DATA_START;
return 1;
}
static int next_packet_smjpeg(bgav_demuxer_context_t * ctx)
{
uint32_t fourcc, length, timestamp;
bgav_stream_t * s;
bgav_packet_t * p;
if(!bgav_input_read_fourcc(ctx->input, &fourcc) ||
(fourcc == BGAV_MK_FOURCC('D','O','N','E')))
return 0;
if(!bgav_input_read_32_be(ctx->input, ×tamp) ||
!bgav_input_read_32_be(ctx->input, &length))
return 0;
if(fourcc == BGAV_MK_FOURCC('s','n','d','D'))
s = bgav_track_find_stream(ctx, AUDIO_ID);
else if(fourcc == BGAV_MK_FOURCC('v','i','d','D'))
s = bgav_track_find_stream(ctx, VIDEO_ID);
else
return 0;
if(!s)
bgav_input_skip(ctx->input, length);
else
{
p = bgav_stream_get_packet_write(s);
bgav_packet_alloc(p, length);
if(bgav_input_read_data(ctx->input, p->data, length) < length)
return 0;
p->data_size = length;
p->pts = timestamp;
bgav_stream_done_packet_write(s, p);
}
return 1;
}
static void close_smjpeg(bgav_demuxer_context_t * ctx)
{
}
const bgav_demuxer_t bgav_demuxer_smjpeg =
{
.probe = probe_smjpeg,
.open = open_smjpeg,
.next_packet = next_packet_smjpeg,
.close = close_smjpeg
};
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