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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "bytestream.h"
#include "avcodec.h"
#include "parser_internal.h"
static int parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
GetByteContext gb;
uint8_t flags, depth, chroma_format, alpha_channel_type;
*poutbuf = buf;
*poutbuf_size = buf_size;
/* Frame fields + frame header size */
if (buf_size < 28)
return buf_size;
bytestream2_init(&gb, buf, buf_size);
/* Frame size */
if (bytestream2_get_be32(&gb) != buf_size)
return buf_size;
/* Frame identifier */
if (bytestream2_get_le32(&gb) != MKTAG('i','c','p','f'))
return buf_size;
/* Frame header size */
if (bytestream2_get_be16(&gb) < 20)
return buf_size;
bytestream2_skip(&gb, 6); /* Bitstream version, encoder identifier */
s->key_frame = 1;
s->pict_type = AV_PICTURE_TYPE_I;
s->width = bytestream2_get_be16(&gb);
s->height = bytestream2_get_be16(&gb);
s->coded_width = FFALIGN(s->width, 16);
s->coded_height = FFALIGN(s->height, 16);
flags = bytestream2_get_byte(&gb);
/* Interlace mode */
switch (flags >> 2 & 3) {
case 0:
s->field_order = AV_FIELD_PROGRESSIVE;
s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
break;
case 1:
s->field_order = AV_FIELD_TT;
s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
break;
case 2:
s->field_order = AV_FIELD_BB;
s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
break;
default:
break;
}
bytestream2_skip(&gb, 4); /* Aspect ratio information, frame rate code, color primaries, transfer characteristic, matrix coefficients */
/* Determine pixel format based on color depth, chroma format and alpha type */
switch (avctx->codec_tag) {
case MKTAG('a','p','c','o'):
case MKTAG('a','p','c','s'):
case MKTAG('a','p','c','n'):
case MKTAG('a','p','c','h'):
depth = 10;
break;
case MKTAG('a','p','4','h'):
case MKTAG('a','p','4','x'):
depth = 12;
break;
default:
return buf_size;
}
chroma_format = flags >> 6 & 3;
if (chroma_format < 2)
return buf_size;
alpha_channel_type = bytestream2_get_byte(&gb) & 0xf;
switch (depth | (chroma_format << 4) | (alpha_channel_type << 8)) {
case 10 | (2 << 4) | (0 << 8): s->format = AV_PIX_FMT_YUV422P10; break;
case 10 | (2 << 4) | (1 << 8):
case 10 | (2 << 4) | (2 << 8): s->format = AV_PIX_FMT_YUVA422P10; break;
case 10 | (3 << 4) | (0 << 8): s->format = AV_PIX_FMT_YUV444P10; break;
case 10 | (3 << 4) | (1 << 8):
case 10 | (3 << 4) | (2 << 8): s->format = AV_PIX_FMT_YUVA444P10; break;
case 12 | (2 << 4) | (0 << 8): s->format = AV_PIX_FMT_YUV422P12; break;
case 12 | (2 << 4) | (1 << 8):
case 12 | (2 << 4) | (2 << 8): s->format = AV_PIX_FMT_YUVA422P12; break;
case 12 | (3 << 4) | (0 << 8): s->format = AV_PIX_FMT_YUV444P12; break;
case 12 | (3 << 4) | (1 << 8):
case 12 | (3 << 4) | (2 << 8): s->format = AV_PIX_FMT_YUVA444P12; break;
}
return buf_size;
}
const FFCodecParser ff_prores_parser = {
PARSER_CODEC_LIST(AV_CODEC_ID_PRORES),
.parse = parse,
};
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