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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 <string.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
// #include <yuv4mpeg.h>
#define LOG_DOMAIN "demux_image"
#define PROBE_LEN 12
typedef struct
{
} image_t;
static const uint8_t png_sig[] = { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A };
static int is_png(const uint8_t * data)
{
if(!memcmp(data, png_sig, 8))
return 1;
else
return 0;
}
static const uint8_t tiff_sig_be[] = { 0x4D, 0x4D, 0x00, 0x2A };
static const uint8_t tiff_sig_le[] = { 0x49, 0x49, 0x2A, 0x00 };
static int is_tiff(const uint8_t * data)
{
if(!memcmp(data, tiff_sig_le, 4) ||
!memcmp(data, tiff_sig_be, 4))
return 1;
else
return 0;
}
static const uint8_t jpeg_sig_raw[] = { 0xFF, 0xD8, 0xFF, 0xDB };
static const uint8_t jpeg_sig_jfif_l[] = { 0xFF, 0xD8, 0xFF, 0xE0 };
static const uint8_t jpeg_sig_jfif_h[] = { 0x4A, 0x46, 0x49, 0x46, 0x00, 0x01 };
static const uint8_t jpeg_sig_exif_l[] = { 0xFF, 0xD8, 0xFF, 0xE1 };
static const uint8_t jpeg_sig_exif_h[] = { 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 };
static int is_jpeg(const uint8_t * data)
{
if(!memcmp(data, jpeg_sig_raw, 4))
return 1;
if(!memcmp(data, jpeg_sig_jfif_l, 4) &&
!memcmp(data + 6, jpeg_sig_jfif_h, 6))
return 1;
if(!memcmp(data, jpeg_sig_exif_l, 4) &&
!memcmp(data + 6, jpeg_sig_exif_h, 6))
return 1;
return 0;
}
static int probe_image(bgav_input_context_t * input)
{
uint8_t probe_data[PROBE_LEN];
if(input->total_bytes <= 0)
return 0;
if(bgav_input_get_data(input, probe_data, PROBE_LEN) < PROBE_LEN)
return 0;
// https://en.wikipedia.org/wiki/List_of_file_signatures
if(is_png(probe_data) ||
is_tiff(probe_data) ||
is_jpeg(probe_data))
return 1;
return 0;
}
static int open_image(bgav_demuxer_context_t * ctx)
{
uint8_t probe_data[PROBE_LEN];
bgav_stream_t * s;
/* Create track table */
ctx->tt = bgav_track_table_create(1);
/* Set up the stream */
s = bgav_track_add_video_stream(ctx->tt->cur, ctx->opt);
if(bgav_input_get_data(ctx->input, probe_data, PROBE_LEN) < PROBE_LEN)
return 0;
if(is_png(probe_data))
{
s->fourcc = BGAV_MK_FOURCC('p', 'n', 'g', ' ');
bgav_track_set_format(ctx->tt->cur, "PNG image", "image/png");
}
else if(is_tiff(probe_data))
{
s->fourcc = BGAV_MK_FOURCC('t', 'i', 'f', 'f');
bgav_track_set_format(ctx->tt->cur, "TIFF image", "image/tiff");
}
else if(is_jpeg(probe_data))
{
s->fourcc = BGAV_MK_FOURCC('j', 'p', 'e', 'g');
bgav_track_set_format(ctx->tt->cur, "JPEG image", "image/jpeg");
}
s->data.video.format->timescale = 1000; // Actually arbitrary since we only have pts = 0
s->data.video.format->frame_duration = 0;
s->data.video.format->framerate_mode = GAVL_FRAMERATE_STILL;
s->timescale = s->data.video.format->timescale;
s->data.video.format->pixel_width = 1;
s->data.video.format->pixel_height = 1;
s->ci.flags &= ~(GAVL_COMPRESSION_HAS_B_FRAMES | GAVL_COMPRESSION_HAS_P_FRAMES);
ctx->index_mode = INDEX_MODE_SIMPLE;
return 1;
}
static int select_track_image(bgav_demuxer_context_t * ctx, int track)
{
return 1;
}
static int next_packet_image(bgav_demuxer_context_t * ctx)
{
bgav_packet_t * p;
bgav_stream_t * s;
s = bgav_track_get_video_stream(ctx->tt->cur, 0);
p = bgav_stream_get_packet_write(s);
p->position = 0;
bgav_packet_alloc(p, ctx->input->total_bytes);
if(bgav_input_read_data(ctx->input, p->data, ctx->input->total_bytes) < ctx->input->total_bytes)
return 0;
p->data_size = ctx->input->total_bytes;
p->pts = 0;
PACKET_SET_KEYFRAME(p);
p->duration = s->data.video.format->frame_duration;
bgav_stream_done_packet_write(s, p);
return 1;
}
static void resync_image(bgav_demuxer_context_t * ctx, bgav_stream_t * s)
{
}
static void close_image(bgav_demuxer_context_t * ctx)
{
}
const bgav_demuxer_t bgav_demuxer_image =
{
.probe = probe_image,
.open = open_image,
.select_track = select_track_image,
.next_packet = next_packet_image,
.resync = resync_image,
.close = close_image
};
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