[deb_ffmpeg.git] / ffmpeg / libavformat / yuv4mpegdec.c

/*
 * 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 "avformat.h"
#include "internal.h"
#include "yuv4mpeg.h"

/* Header size increased to allow room for optional flags */
#define MAX_YUV4_HEADER 80
#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;
    AVStream *st;
    enum AVFieldOrder field_order;

    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)
        return -1;
    if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
        return -1;

    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
            if (strncmp("420jpeg", tokstart, 7) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P;
                chroma_sample_location = AVCHROMA_LOC_CENTER;
            } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P;
                chroma_sample_location = AVCHROMA_LOC_LEFT;
            } else if (strncmp("420paldv", tokstart, 8) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P;
                chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
            } else if (strncmp("420p16", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P16;
            } else if (strncmp("422p16", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV422P16;
            } else if (strncmp("444p16", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV444P16;
            } else if (strncmp("420p14", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P14;
            } else if (strncmp("422p14", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV422P14;
            } else if (strncmp("444p14", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV444P14;
            } else if (strncmp("420p12", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P12;
            } else if (strncmp("422p12", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV422P12;
            } else if (strncmp("444p12", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV444P12;
            } else if (strncmp("420p10", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P10;
            } else if (strncmp("422p10", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV422P10;
            } else if (strncmp("444p10", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_YUV444P10;
            } else if (strncmp("420p9", tokstart, 5) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P9;
            } else if (strncmp("422p9", tokstart, 5) == 0) {
                pix_fmt = AV_PIX_FMT_YUV422P9;
            } else if (strncmp("444p9", tokstart, 5) == 0) {
                pix_fmt = AV_PIX_FMT_YUV444P9;
            } else if (strncmp("420", tokstart, 3) == 0) {
                pix_fmt = AV_PIX_FMT_YUV420P;
                chroma_sample_location = AVCHROMA_LOC_CENTER;
            } else if (strncmp("411", tokstart, 3) == 0) {
                pix_fmt = AV_PIX_FMT_YUV411P;
            } else if (strncmp("422", tokstart, 3) == 0) {
                pix_fmt = AV_PIX_FMT_YUV422P;
            } else if (strncmp("444alpha", tokstart, 8) == 0 ) {
                av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
                       "YUV4MPEG stream.\n");
                return -1;
            } else if (strncmp("444", tokstart, 3) == 0) {
                pix_fmt = AV_PIX_FMT_YUV444P;
            } else if (strncmp("mono16", tokstart, 6) == 0) {
                pix_fmt = AV_PIX_FMT_GRAY16;
            } else if (strncmp("mono", tokstart, 4) == 0) {
                pix_fmt = AV_PIX_FMT_GRAY8;
            } else {
                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
                       "pixel format.\n");
                return -1;
            }
            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) {
                // Older nonstandard pixel format representation
                tokstart += 6;
                if (strncmp("420JPEG", tokstart, 7) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
                else if (strncmp("420MPEG2", tokstart, 8) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
                else if (strncmp("420PALDV", tokstart, 8) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
                else if (strncmp("420P9", tokstart, 5) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P9;
                else if (strncmp("422P9", tokstart, 5) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV422P9;
                else if (strncmp("444P9", tokstart, 5) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV444P9;
                else if (strncmp("420P10", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P10;
                else if (strncmp("422P10", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV422P10;
                else if (strncmp("444P10", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV444P10;
                else if (strncmp("420P12", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P12;
                else if (strncmp("422P12", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV422P12;
                else if (strncmp("444P12", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV444P12;
                else if (strncmp("420P14", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P14;
                else if (strncmp("422P14", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV422P14;
                else if (strncmp("444P14", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV444P14;
                else if (strncmp("420P16", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV420P16;
                else if (strncmp("422P16", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV422P16;
                else if (strncmp("444P16", tokstart, 6) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV444P16;
                else if (strncmp("411", tokstart, 3) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV411P;
                else if (strncmp("422", tokstart, 3) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV422P;
                else if (strncmp("444", tokstart, 3) == 0)
                    alt_pix_fmt = AV_PIX_FMT_YUV444P;
            }
            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 -1;
    }

    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->codec->width  = width;
    st->codec->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->codec->pix_fmt                = pix_fmt;
    st->codec->codec_type             = AVMEDIA_TYPE_VIDEO;
    st->codec->codec_id               = AV_CODEC_ID_RAWVIDEO;
    st->sample_aspect_ratio           = (AVRational){ aspectn, aspectd };
    st->codec->chroma_sample_location = chroma_sample_location;
    st->codec->field_order            = field_order;

    return 0;
}

static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int i;
    char header[MAX_FRAME_HEADER+1];
    int packet_size, width, height, ret;
    AVStream *st = s->streams[0];

    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;

    width  = st->codec->width;
    height = st->codec->height;

    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
    if (packet_size < 0)
        return packet_size;

    ret = av_get_packet(s->pb, pkt, packet_size);
    if (ret < 0)
        return ret;
    else if (ret != packet_size)
        return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);

    pkt->stream_index = 0;
    return 0;
}

static int yuv4_probe(AVProbeData *pd)
{
    /* check file header */
    if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

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,
    .extensions     = "y4m",
};
Commit	Line	Data
	1	/*
	2	* YUV4MPEG demuxer
	3	* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include "avformat.h"
	23	#include "internal.h"
	24	#include "yuv4mpeg.h"
	25
	26	/* Header size increased to allow room for optional flags */
	27	#define MAX_YUV4_HEADER 80
	28	#define MAX_FRAME_HEADER 80
	29
	30	static int yuv4_read_header(AVFormatContext *s)
	31	{
	32	char header[MAX_YUV4_HEADER + 10]; // Include headroom for
	33	// the longest option
	34	char tokstart, tokend, *header_end;
	35	int i;
	36	AVIOContext *pb = s->pb;
	37	int width = -1, height = -1, raten = 0,
	38	rated = 0, aspectn = 0, aspectd = 0;
	39	enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
	40	enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
	41	AVStream *st;
	42	enum AVFieldOrder field_order;
	43
	44	for (i = 0; i < MAX_YUV4_HEADER; i++) {
	45	header[i] = avio_r8(pb);
	46	if (header[i] == '\n') {
	47	header[i + 1] = 0x20; // Add a space after last option.
	48	// Makes parsing "444" vs "444alpha" easier.
	49	header[i + 2] = 0;
	50	break;
	51	}
	52	}
	53	if (i == MAX_YUV4_HEADER)
	54	return -1;
	55	if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
	56	return -1;
	57
	58	header_end = &header[i + 1]; // Include space
	59	for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
	60	tokstart < header_end; tokstart++) {
	61	if (*tokstart == 0x20)
	62	continue;
	63	switch (*tokstart++) {
	64	case 'W': // Width. Required.
	65	width = strtol(tokstart, &tokend, 10);
	66	tokstart = tokend;
	67	break;
	68	case 'H': // Height. Required.
	69	height = strtol(tokstart, &tokend, 10);
	70	tokstart = tokend;
	71	break;
	72	case 'C': // Color space
	73	if (strncmp("420jpeg", tokstart, 7) == 0) {
	74	pix_fmt = AV_PIX_FMT_YUV420P;
	75	chroma_sample_location = AVCHROMA_LOC_CENTER;
	76	} else if (strncmp("420mpeg2", tokstart, 8) == 0) {
	77	pix_fmt = AV_PIX_FMT_YUV420P;
	78	chroma_sample_location = AVCHROMA_LOC_LEFT;
	79	} else if (strncmp("420paldv", tokstart, 8) == 0) {
	80	pix_fmt = AV_PIX_FMT_YUV420P;
	81	chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
	82	} else if (strncmp("420p16", tokstart, 6) == 0) {
	83	pix_fmt = AV_PIX_FMT_YUV420P16;
	84	} else if (strncmp("422p16", tokstart, 6) == 0) {
	85	pix_fmt = AV_PIX_FMT_YUV422P16;
	86	} else if (strncmp("444p16", tokstart, 6) == 0) {
	87	pix_fmt = AV_PIX_FMT_YUV444P16;
	88	} else if (strncmp("420p14", tokstart, 6) == 0) {
	89	pix_fmt = AV_PIX_FMT_YUV420P14;
	90	} else if (strncmp("422p14", tokstart, 6) == 0) {
	91	pix_fmt = AV_PIX_FMT_YUV422P14;
	92	} else if (strncmp("444p14", tokstart, 6) == 0) {
	93	pix_fmt = AV_PIX_FMT_YUV444P14;
	94	} else if (strncmp("420p12", tokstart, 6) == 0) {
	95	pix_fmt = AV_PIX_FMT_YUV420P12;
	96	} else if (strncmp("422p12", tokstart, 6) == 0) {
	97	pix_fmt = AV_PIX_FMT_YUV422P12;
	98	} else if (strncmp("444p12", tokstart, 6) == 0) {
	99	pix_fmt = AV_PIX_FMT_YUV444P12;
	100	} else if (strncmp("420p10", tokstart, 6) == 0) {
	101	pix_fmt = AV_PIX_FMT_YUV420P10;
	102	} else if (strncmp("422p10", tokstart, 6) == 0) {
	103	pix_fmt = AV_PIX_FMT_YUV422P10;
	104	} else if (strncmp("444p10", tokstart, 6) == 0) {
	105	pix_fmt = AV_PIX_FMT_YUV444P10;
	106	} else if (strncmp("420p9", tokstart, 5) == 0) {
	107	pix_fmt = AV_PIX_FMT_YUV420P9;
	108	} else if (strncmp("422p9", tokstart, 5) == 0) {
	109	pix_fmt = AV_PIX_FMT_YUV422P9;
	110	} else if (strncmp("444p9", tokstart, 5) == 0) {
	111	pix_fmt = AV_PIX_FMT_YUV444P9;
	112	} else if (strncmp("420", tokstart, 3) == 0) {
	113	pix_fmt = AV_PIX_FMT_YUV420P;
	114	chroma_sample_location = AVCHROMA_LOC_CENTER;
	115	} else if (strncmp("411", tokstart, 3) == 0) {
	116	pix_fmt = AV_PIX_FMT_YUV411P;
	117	} else if (strncmp("422", tokstart, 3) == 0) {
	118	pix_fmt = AV_PIX_FMT_YUV422P;
	119	} else if (strncmp("444alpha", tokstart, 8) == 0 ) {
	120	av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
	121	"YUV4MPEG stream.\n");
	122	return -1;
	123	} else if (strncmp("444", tokstart, 3) == 0) {
	124	pix_fmt = AV_PIX_FMT_YUV444P;
	125	} else if (strncmp("mono16", tokstart, 6) == 0) {
	126	pix_fmt = AV_PIX_FMT_GRAY16;
	127	} else if (strncmp("mono", tokstart, 4) == 0) {
	128	pix_fmt = AV_PIX_FMT_GRAY8;
	129	} else {
	130	av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
	131	"pixel format.\n");
	132	return -1;
	133	}
	134	while (tokstart < header_end && *tokstart != 0x20)
	135	tokstart++;
	136	break;
	137	case 'I': // Interlace type
	138	switch (*tokstart++){
	139	case '?':
	140	field_order = AV_FIELD_UNKNOWN;
	141	break;
	142	case 'p':
	143	field_order = AV_FIELD_PROGRESSIVE;
	144	break;
	145	case 't':
	146	field_order = AV_FIELD_TT;
	147	break;
	148	case 'b':
	149	field_order = AV_FIELD_BB;
	150	break;
	151	case 'm':
	152	av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
	153	"interlaced and non-interlaced frames.\n");
	154	default:
	155	av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
	156	return AVERROR(EINVAL);
	157	}
	158	break;
	159	case 'F': // Frame rate
	160	sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
	161	while (tokstart < header_end && *tokstart != 0x20)
	162	tokstart++;
	163	break;
	164	case 'A': // Pixel aspect
	165	sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
	166	while (tokstart < header_end && *tokstart != 0x20)
	167	tokstart++;
	168	break;
	169	case 'X': // Vendor extensions
	170	if (strncmp("YSCSS=", tokstart, 6) == 0) {
	171	// Older nonstandard pixel format representation
	172	tokstart += 6;
	173	if (strncmp("420JPEG", tokstart, 7) == 0)
	174	alt_pix_fmt = AV_PIX_FMT_YUV420P;
	175	else if (strncmp("420MPEG2", tokstart, 8) == 0)
	176	alt_pix_fmt = AV_PIX_FMT_YUV420P;
	177	else if (strncmp("420PALDV", tokstart, 8) == 0)
	178	alt_pix_fmt = AV_PIX_FMT_YUV420P;
	179	else if (strncmp("420P9", tokstart, 5) == 0)
	180	alt_pix_fmt = AV_PIX_FMT_YUV420P9;
	181	else if (strncmp("422P9", tokstart, 5) == 0)
	182	alt_pix_fmt = AV_PIX_FMT_YUV422P9;
	183	else if (strncmp("444P9", tokstart, 5) == 0)
	184	alt_pix_fmt = AV_PIX_FMT_YUV444P9;
	185	else if (strncmp("420P10", tokstart, 6) == 0)
	186	alt_pix_fmt = AV_PIX_FMT_YUV420P10;
	187	else if (strncmp("422P10", tokstart, 6) == 0)
	188	alt_pix_fmt = AV_PIX_FMT_YUV422P10;
	189	else if (strncmp("444P10", tokstart, 6) == 0)
	190	alt_pix_fmt = AV_PIX_FMT_YUV444P10;
	191	else if (strncmp("420P12", tokstart, 6) == 0)
	192	alt_pix_fmt = AV_PIX_FMT_YUV420P12;
	193	else if (strncmp("422P12", tokstart, 6) == 0)
	194	alt_pix_fmt = AV_PIX_FMT_YUV422P12;
	195	else if (strncmp("444P12", tokstart, 6) == 0)
	196	alt_pix_fmt = AV_PIX_FMT_YUV444P12;
	197	else if (strncmp("420P14", tokstart, 6) == 0)
	198	alt_pix_fmt = AV_PIX_FMT_YUV420P14;
	199	else if (strncmp("422P14", tokstart, 6) == 0)
	200	alt_pix_fmt = AV_PIX_FMT_YUV422P14;
	201	else if (strncmp("444P14", tokstart, 6) == 0)
	202	alt_pix_fmt = AV_PIX_FMT_YUV444P14;
	203	else if (strncmp("420P16", tokstart, 6) == 0)
	204	alt_pix_fmt = AV_PIX_FMT_YUV420P16;
	205	else if (strncmp("422P16", tokstart, 6) == 0)
	206	alt_pix_fmt = AV_PIX_FMT_YUV422P16;
	207	else if (strncmp("444P16", tokstart, 6) == 0)
	208	alt_pix_fmt = AV_PIX_FMT_YUV444P16;
	209	else if (strncmp("411", tokstart, 3) == 0)
	210	alt_pix_fmt = AV_PIX_FMT_YUV411P;
	211	else if (strncmp("422", tokstart, 3) == 0)
	212	alt_pix_fmt = AV_PIX_FMT_YUV422P;
	213	else if (strncmp("444", tokstart, 3) == 0)
	214	alt_pix_fmt = AV_PIX_FMT_YUV444P;
	215	}
	216	while (tokstart < header_end && *tokstart != 0x20)
	217	tokstart++;
	218	break;
	219	}
	220	}
	221
	222	if (width == -1 \|\| height == -1) {
	223	av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
	224	return -1;
	225	}
	226
	227	if (pix_fmt == AV_PIX_FMT_NONE) {
	228	if (alt_pix_fmt == AV_PIX_FMT_NONE)
	229	pix_fmt = AV_PIX_FMT_YUV420P;
	230	else
	231	pix_fmt = alt_pix_fmt;
	232	}
	233
	234	if (raten <= 0 \|\| rated <= 0) {
	235	// Frame rate unknown
	236	raten = 25;
	237	rated = 1;
	238	}
	239
	240	if (aspectn == 0 && aspectd == 0) {
	241	// Pixel aspect unknown
	242	aspectd = 1;
	243	}
	244
	245	st = avformat_new_stream(s, NULL);
	246	if (!st)
	247	return AVERROR(ENOMEM);
	248	st->codec->width = width;
	249	st->codec->height = height;
	250	av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
	251	avpriv_set_pts_info(st, 64, rated, raten);
	252	st->avg_frame_rate = av_inv_q(st->time_base);
	253	st->codec->pix_fmt = pix_fmt;
	254	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	255	st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
	256	st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
	257	st->codec->chroma_sample_location = chroma_sample_location;
	258	st->codec->field_order = field_order;
	259
	260	return 0;
	261	}
	262
	263	static int yuv4_read_packet(AVFormatContext s, AVPacket pkt)
	264	{
	265	int i;
	266	char header[MAX_FRAME_HEADER+1];
	267	int packet_size, width, height, ret;
	268	AVStream *st = s->streams[0];
	269
	270	for (i = 0; i < MAX_FRAME_HEADER; i++) {
	271	header[i] = avio_r8(s->pb);
	272	if (header[i] == '\n') {
	273	header[i + 1] = 0;
	274	break;
	275	}
	276	}
	277	if (s->pb->error)
	278	return s->pb->error;
	279	else if (s->pb->eof_reached)
	280	return AVERROR_EOF;
	281	else if (i == MAX_FRAME_HEADER)
	282	return AVERROR_INVALIDDATA;
	283
	284	if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
	285	return AVERROR_INVALIDDATA;
	286
	287	width = st->codec->width;
	288	height = st->codec->height;
	289
	290	packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
	291	if (packet_size < 0)
	292	return packet_size;
	293
	294	ret = av_get_packet(s->pb, pkt, packet_size);
	295	if (ret < 0)
	296	return ret;
	297	else if (ret != packet_size)
	298	return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
	299
	300	pkt->stream_index = 0;
	301	return 0;
	302	}
	303
	304	static int yuv4_probe(AVProbeData *pd)
	305	{
	306	/* check file header */
	307	if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
	308	return AVPROBE_SCORE_MAX;
	309	else
	310	return 0;
	311	}
	312
	313	AVInputFormat ff_yuv4mpegpipe_demuxer = {
	314	.name = "yuv4mpegpipe",
	315	.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
	316	.read_probe = yuv4_probe,
	317	.read_header = yuv4_read_header,
	318	.read_packet = yuv4_read_packet,
	319	.extensions = "y4m",
	320	};