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FFmpeg/libavformat/yuv4mpegdec.c

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/*
* YUV4MPEG demuxer
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
*
* 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/avstring.h"
#include "libavutil/imgutils.h"
#include "avformat.h"
#include "internal.h"
#include "yuv4mpeg.h"
/* Header size increased to allow room for optional flags */
#define MAX_YUV4_HEADER 96
#define MAX_FRAME_HEADER 80
static int yuv4_read_header(AVFormatContext *s)
{
char header[MAX_YUV4_HEADER + 10]; // Include headroom for
// the longest option
char *tokstart, *tokend, *header_end;
int i;
AVIOContext *pb = s->pb;
int width = -1, height = -1, raten = 0,
rated = 0, aspectn = 0, aspectd = 0;
enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
enum AVFieldOrder field_order = AV_FIELD_UNKNOWN;
enum AVColorRange color_range = AVCOL_RANGE_UNSPECIFIED;
AVStream *st;
for (i = 0; i < MAX_YUV4_HEADER; i++) {
header[i] = avio_r8(pb);
if (header[i] == '\n') {
header[i + 1] = 0x20; // Add a space after last option.
// Makes parsing "444" vs "444alpha" easier.
header[i + 2] = 0;
break;
}
}
if (i == MAX_YUV4_HEADER) {
av_log(s, AV_LOG_ERROR, "Header too large.\n");
return AVERROR(EINVAL);
}
if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) {
av_log(s, AV_LOG_ERROR, "Invalid magic number for yuv4mpeg.\n");
return AVERROR(EINVAL);
}
header_end = &header[i + 1]; // Include space
for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
tokstart < header_end; tokstart++) {
if (*tokstart == 0x20)
continue;
switch (*tokstart++) {
case 'W': // Width. Required.
width = strtol(tokstart, &tokend, 10);
tokstart = tokend;
break;
case 'H': // Height. Required.
height = strtol(tokstart, &tokend, 10);
tokstart = tokend;
break;
case 'C': // Color space
{
static const struct {
#define MAX_PIX_FMT_LENGTH 8
char name[MAX_PIX_FMT_LENGTH + 1];
#undef MAX_PIX_FMT_LENGTH
enum AVPixelFormat pix_fmt;
enum AVChromaLocation chroma_loc;
} pix_fmt_array[] = {
{ "420jpeg", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_CENTER },
{ "420mpeg2", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_LEFT },
{ "420paldv", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_TOPLEFT },
{ "420p16", AV_PIX_FMT_YUV420P16, AVCHROMA_LOC_UNSPECIFIED },
{ "422p16", AV_PIX_FMT_YUV422P16, AVCHROMA_LOC_UNSPECIFIED },
{ "444p16", AV_PIX_FMT_YUV444P16, AVCHROMA_LOC_UNSPECIFIED },
{ "420p14", AV_PIX_FMT_YUV420P14, AVCHROMA_LOC_UNSPECIFIED },
{ "422p14", AV_PIX_FMT_YUV422P14, AVCHROMA_LOC_UNSPECIFIED },
{ "444p14", AV_PIX_FMT_YUV444P14, AVCHROMA_LOC_UNSPECIFIED },
{ "420p12", AV_PIX_FMT_YUV420P12, AVCHROMA_LOC_UNSPECIFIED },
{ "422p12", AV_PIX_FMT_YUV422P12, AVCHROMA_LOC_UNSPECIFIED },
{ "444p12", AV_PIX_FMT_YUV444P12, AVCHROMA_LOC_UNSPECIFIED },
{ "420p10", AV_PIX_FMT_YUV420P10, AVCHROMA_LOC_UNSPECIFIED },
{ "422p10", AV_PIX_FMT_YUV422P10, AVCHROMA_LOC_UNSPECIFIED },
{ "444p10", AV_PIX_FMT_YUV444P10, AVCHROMA_LOC_UNSPECIFIED },
{ "420p9", AV_PIX_FMT_YUV420P9, AVCHROMA_LOC_UNSPECIFIED },
{ "422p9", AV_PIX_FMT_YUV422P9, AVCHROMA_LOC_UNSPECIFIED },
{ "444p9", AV_PIX_FMT_YUV444P9, AVCHROMA_LOC_UNSPECIFIED },
{ "420", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_CENTER },
{ "411", AV_PIX_FMT_YUV411P, AVCHROMA_LOC_UNSPECIFIED },
{ "422", AV_PIX_FMT_YUV422P, AVCHROMA_LOC_UNSPECIFIED },
{ "444alpha", AV_PIX_FMT_YUVA444P, AVCHROMA_LOC_UNSPECIFIED },
{ "444", AV_PIX_FMT_YUV444P, AVCHROMA_LOC_UNSPECIFIED },
{ "mono16", AV_PIX_FMT_GRAY16, AVCHROMA_LOC_UNSPECIFIED },
{ "mono12", AV_PIX_FMT_GRAY12, AVCHROMA_LOC_UNSPECIFIED },
{ "mono10", AV_PIX_FMT_GRAY10, AVCHROMA_LOC_UNSPECIFIED },
{ "mono9", AV_PIX_FMT_GRAY9, AVCHROMA_LOC_UNSPECIFIED },
{ "mono", AV_PIX_FMT_GRAY8, AVCHROMA_LOC_UNSPECIFIED },
};
for (i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++) {
if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) {
pix_fmt = pix_fmt_array[i].pix_fmt;
if (pix_fmt_array[i].chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
chroma_sample_location = pix_fmt_array[i].chroma_loc;
break;
}
}
if (i == FF_ARRAY_ELEMS(pix_fmt_array)) {
av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
"pixel format.\n");
return AVERROR_INVALIDDATA;
}
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
}
case 'I': // Interlace type
switch (*tokstart++){
case '?':
field_order = AV_FIELD_UNKNOWN;
break;
case 'p':
field_order = AV_FIELD_PROGRESSIVE;
break;
case 't':
field_order = AV_FIELD_TT;
break;
case 'b':
field_order = AV_FIELD_BB;
break;
case 'm':
av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
"interlaced and non-interlaced frames.\n");
default:
av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
return AVERROR(EINVAL);
}
break;
case 'F': // Frame rate
sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
case 'A': // Pixel aspect
sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
case 'X': // Vendor extensions
if (strncmp("YSCSS=", tokstart, 6) == 0) {
static const struct {
#define MAX_PIX_FMT_LENGTH 8
char name[MAX_PIX_FMT_LENGTH + 1];
#undef MAX_PIX_FMT_LENGTH
enum AVPixelFormat pix_fmt;
} pix_fmt_array[] = {
{ "420JPEG", AV_PIX_FMT_YUV420P },
{ "420MPEG2", AV_PIX_FMT_YUV420P },
{ "420PALDV", AV_PIX_FMT_YUV420P },
{ "420P9", AV_PIX_FMT_YUV420P9 },
{ "422P9", AV_PIX_FMT_YUV422P9 },
{ "444P9", AV_PIX_FMT_YUV444P9 },
{ "420P10", AV_PIX_FMT_YUV420P10 },
{ "444P10", AV_PIX_FMT_YUV444P10 },
{ "420P12", AV_PIX_FMT_YUV420P12 },
{ "422P12", AV_PIX_FMT_YUV422P12 },
{ "444P12", AV_PIX_FMT_YUV444P12 },
{ "420P14", AV_PIX_FMT_YUV420P14 },
{ "422P14", AV_PIX_FMT_YUV422P14 },
{ "444P14", AV_PIX_FMT_YUV444P14 },
{ "420P16", AV_PIX_FMT_YUV420P16 },
{ "422P16", AV_PIX_FMT_YUV422P16 },
{ "444P16", AV_PIX_FMT_YUV444P16 },
{ "411", AV_PIX_FMT_YUV411P },
{ "422", AV_PIX_FMT_YUV422P },
{ "444", AV_PIX_FMT_YUV444P },
};
// Older nonstandard pixel format representation
tokstart += 6;
for (size_t i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++)
if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) {
alt_pix_fmt = pix_fmt_array[i].pix_fmt;
break;
}
} else if (strncmp("COLORRANGE=", tokstart, 11) == 0) {
tokstart += 11;
if (strncmp("FULL",tokstart, 4) == 0)
color_range = AVCOL_RANGE_JPEG;
else if (strncmp("LIMITED", tokstart, 7) == 0)
color_range = AVCOL_RANGE_MPEG;
}
while (tokstart < header_end && *tokstart != 0x20)
tokstart++;
break;
}
}
if (width == -1 || height == -1) {
av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
return AVERROR_INVALIDDATA;
}
if (pix_fmt == AV_PIX_FMT_NONE) {
if (alt_pix_fmt == AV_PIX_FMT_NONE)
pix_fmt = AV_PIX_FMT_YUV420P;
else
pix_fmt = alt_pix_fmt;
}
if (raten <= 0 || rated <= 0) {
// Frame rate unknown
raten = 25;
rated = 1;
}
if (aspectn == 0 && aspectd == 0) {
// Pixel aspect unknown
aspectd = 1;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->width = width;
st->codecpar->height = height;
av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
avpriv_set_pts_info(st, 64, rated, raten);
st->avg_frame_rate = av_inv_q(st->time_base);
st->codecpar->format = pix_fmt;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
st->codecpar->chroma_location = chroma_sample_location;
st->codecpar->color_range = color_range;
st->codecpar->field_order = field_order;
s->packet_size = av_image_get_buffer_size(st->codecpar->format, width, height, 1) + Y4M_FRAME_MAGIC_LEN;
if ((int) s->packet_size < 0)
return s->packet_size;
s->internal->data_offset = avio_tell(pb);
st->duration = (avio_size(pb) - avio_tell(pb)) / s->packet_size;
return 0;
}
static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int i;
char header[MAX_FRAME_HEADER+1];
int ret;
int64_t off = avio_tell(s->pb);
for (i = 0; i < MAX_FRAME_HEADER; i++) {
header[i] = avio_r8(s->pb);
if (header[i] == '\n') {
header[i + 1] = 0;
break;
}
}
if (s->pb->error)
return s->pb->error;
else if (s->pb->eof_reached)
return AVERROR_EOF;
else if (i == MAX_FRAME_HEADER)
return AVERROR_INVALIDDATA;
if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
return AVERROR_INVALIDDATA;
ret = av_get_packet(s->pb, pkt, s->packet_size - Y4M_FRAME_MAGIC_LEN);
if (ret < 0)
return ret;
else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN) {
return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
}
pkt->stream_index = 0;
pkt->pts = (off - s->internal->data_offset) / s->packet_size;
pkt->duration = 1;
return 0;
}
static int yuv4_read_seek(AVFormatContext *s, int stream_index,
int64_t pts, int flags)
{
int64_t pos;
if (flags & AVSEEK_FLAG_BACKWARD)
pts = FFMAX(0, pts - 1);
if (pts < 0)
return -1;
pos = pts * s->packet_size;
if (avio_seek(s->pb, pos + s->internal->data_offset, SEEK_SET) < 0)
return -1;
return 0;
}
static int yuv4_probe(const AVProbeData *pd)
{
/* check file header */
if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
return AVPROBE_SCORE_MAX;
else
return 0;
}
const AVInputFormat ff_yuv4mpegpipe_demuxer = {
.name = "yuv4mpegpipe",
.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
.read_probe = yuv4_probe,
.read_header = yuv4_read_header,
.read_packet = yuv4_read_packet,
.read_seek = yuv4_read_seek,
.extensions = "y4m",
};