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

/*
 * mtv demuxer
 * Copyright (c) 2006 Reynaldo H. Verdejo Pinochet
 *
 * 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
 */

/**
 * @file
 * MTV demuxer.
 */

#include "libavutil/bswap.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"

#define MTV_ASUBCHUNK_DATA_SIZE 500
#define MTV_HEADER_SIZE 512
#define MTV_AUDIO_PADDING_SIZE 12
#define MTV_IMAGE_DEFAULT_BPP 16
#define MTV_AUDIO_SAMPLING_RATE 44100

typedef struct MTVDemuxContext {

    unsigned int file_size;         ///< filesize, not always right
    unsigned int segments;          ///< number of 512 byte segments
    unsigned int audio_identifier;  ///< 'MP3' on all files I have seen
    unsigned int audio_br;          ///< bitrate of audio channel (mp3)
    unsigned int img_colorfmt;      ///< frame colorfmt rgb 565/555
    unsigned int img_bpp;           ///< frame bits per pixel
    unsigned int img_width;
    unsigned int img_height;
    unsigned int img_segment_size;  ///< size of image segment
    unsigned int video_fps;
    unsigned int full_segment_size;

} MTVDemuxContext;

static int mtv_probe(AVProbeData *p)
{
    /* we need at least 57 bytes from the header
     * to try parsing all required fields
     */
    if (p->buf_size < 57)
        return 0;

    /* Magic is 'AMV' */
    if (*p->buf != 'A' || *(p->buf + 1) != 'M' || *(p->buf + 2) != 'V')
        return 0;

    /* Audio magic is always MP3 */
    if (p->buf[43] != 'M' || p->buf[44] != 'P' || p->buf[45] != '3')
        return 0;

    /* Check for nonzero in bpp and (width|height) header fields */
    if(!(p->buf[51] && AV_RL16(&p->buf[52]) | AV_RL16(&p->buf[54])))
        return 0;

    /* If width or height are 0 then imagesize header field should not */
    if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54]))
    {
        if(!!AV_RL16(&p->buf[56]))
            return AVPROBE_SCORE_EXTENSION;
        else
            return 0;
    }

    /* Image bpp is not an absolutely required
     * field as we latter claim it should be 16
     * no matter what. All samples in the wild
     * are RGB565/555.
     */
    if(p->buf[51] != MTV_IMAGE_DEFAULT_BPP)
        return AVPROBE_SCORE_EXTENSION / 2;

    /* We had enough data to parse header values
     * but we expect to be able to get 512 bytes
     * of header to be sure.
     */
    if (p->buf_size < MTV_HEADER_SIZE)
        return AVPROBE_SCORE_EXTENSION;

    return AVPROBE_SCORE_MAX;
}

static int mtv_read_header(AVFormatContext *s)
{
    MTVDemuxContext *mtv = s->priv_data;
    AVIOContext   *pb  = s->pb;
    AVStream        *st;
    unsigned int    audio_subsegments;

    avio_skip(pb, 3);
    mtv->file_size         = avio_rl32(pb);
    mtv->segments          = avio_rl32(pb);
    avio_skip(pb, 32);
    mtv->audio_identifier  = avio_rl24(pb);
    mtv->audio_br          = avio_rl16(pb);
    mtv->img_colorfmt      = avio_rl24(pb);
    mtv->img_bpp           = avio_r8(pb);
    mtv->img_width         = avio_rl16(pb);
    mtv->img_height        = avio_rl16(pb);
    mtv->img_segment_size  = avio_rl16(pb);

    /* Assume 16bpp even if claimed otherwise.
     * We know its going to be RGBG565/555 anyway
     */
    if (mtv->img_bpp != MTV_IMAGE_DEFAULT_BPP) {
        av_log (s, AV_LOG_WARNING, "Header claims %dbpp (!= 16). Ignoring\n",
                mtv->img_bpp);
        mtv->img_bpp = MTV_IMAGE_DEFAULT_BPP;
    }

    /* Calculate width and height if missing from header */

    if (!mtv->img_width && mtv->img_height > 0 && mtv->img_bpp >= 8)
        mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3)
                        / mtv->img_height;

    if (!mtv->img_height && mtv->img_width > 0 && mtv->img_bpp >= 8)
        mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3)
                        / mtv->img_width;

    if(!mtv->img_height || !mtv->img_width || !mtv->img_segment_size){
        av_log(s, AV_LOG_ERROR, "width or height or segment_size is invalid and I cannot calculate them from other information\n");
        return AVERROR_INVALIDDATA;
    }

    avio_skip(pb, 4);
    audio_subsegments = avio_rl16(pb);

    if (audio_subsegments == 0) {
        avpriv_request_sample(s, "MTV files without audio");
        return AVERROR_PATCHWELCOME;
    }

    mtv->full_segment_size =
        audio_subsegments * (MTV_AUDIO_PADDING_SIZE + MTV_ASUBCHUNK_DATA_SIZE) +
        mtv->img_segment_size;
    mtv->video_fps         = (mtv->audio_br / 4) / audio_subsegments;

    // FIXME Add sanity check here

    // all systems go! init decoders

    // video - raw rgb565

    st = avformat_new_stream(s, NULL);
    if(!st)
        return AVERROR(ENOMEM);

    avpriv_set_pts_info(st, 64, 1, mtv->video_fps);
    st->codec->codec_type      = AVMEDIA_TYPE_VIDEO;
    st->codec->codec_id        = AV_CODEC_ID_RAWVIDEO;
    st->codec->pix_fmt         = AV_PIX_FMT_RGB565BE;
    st->codec->width           = mtv->img_width;
    st->codec->height          = mtv->img_height;
    st->codec->extradata       = av_strdup("BottomUp");
    st->codec->extradata_size  = 9;

    // audio - mp3

    st = avformat_new_stream(s, NULL);
    if(!st)
        return AVERROR(ENOMEM);

    avpriv_set_pts_info(st, 64, 1, MTV_AUDIO_SAMPLING_RATE);
    st->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
    st->codec->codec_id        = AV_CODEC_ID_MP3;
    st->codec->bit_rate        = mtv->audio_br;
    st->need_parsing           = AVSTREAM_PARSE_FULL;

    // Jump over header

    if(avio_seek(pb, MTV_HEADER_SIZE, SEEK_SET) != MTV_HEADER_SIZE)
        return AVERROR(EIO);

    return 0;

}

static int mtv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    MTVDemuxContext *mtv = s->priv_data;
    AVIOContext *pb = s->pb;
    int ret;

    if((avio_tell(pb) - s->data_offset + mtv->img_segment_size) % mtv->full_segment_size)
    {
        avio_skip(pb, MTV_AUDIO_PADDING_SIZE);

        ret = av_get_packet(pb, pkt, MTV_ASUBCHUNK_DATA_SIZE);
        if(ret < 0)
            return ret;

        pkt->pos -= MTV_AUDIO_PADDING_SIZE;
        pkt->stream_index = 1;

    }else
    {
        ret = av_get_packet(pb, pkt, mtv->img_segment_size);
        if(ret < 0)
            return ret;

        pkt->stream_index = 0;
    }

    return ret;
}

AVInputFormat ff_mtv_demuxer = {
    .name           = "mtv",
    .long_name      = NULL_IF_CONFIG_SMALL("MTV"),
    .priv_data_size = sizeof(MTVDemuxContext),
    .read_probe     = mtv_probe,
    .read_header    = mtv_read_header,
    .read_packet    = mtv_read_packet,
};
Commit	Line	Data
	1	/*
	2	* mtv demuxer
	3	* Copyright (c) 2006 Reynaldo H. Verdejo Pinochet
	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	/**
	23	* @file
	24	* MTV demuxer.
	25	*/
	26
	27	#include "libavutil/bswap.h"
	28	#include "libavutil/intreadwrite.h"
	29	#include "avformat.h"
	30	#include "internal.h"
	31
	32	#define MTV_ASUBCHUNK_DATA_SIZE 500
	33	#define MTV_HEADER_SIZE 512
	34	#define MTV_AUDIO_PADDING_SIZE 12
	35	#define MTV_IMAGE_DEFAULT_BPP 16
	36	#define MTV_AUDIO_SAMPLING_RATE 44100
	37
	38	typedef struct MTVDemuxContext {
	39
	40	unsigned int file_size; ///< filesize, not always right
	41	unsigned int segments; ///< number of 512 byte segments
	42	unsigned int audio_identifier; ///< 'MP3' on all files I have seen
	43	unsigned int audio_br; ///< bitrate of audio channel (mp3)
	44	unsigned int img_colorfmt; ///< frame colorfmt rgb 565/555
	45	unsigned int img_bpp; ///< frame bits per pixel
	46	unsigned int img_width;
	47	unsigned int img_height;
	48	unsigned int img_segment_size; ///< size of image segment
	49	unsigned int video_fps;
	50	unsigned int full_segment_size;
	51
	52	} MTVDemuxContext;
	53
	54	static int mtv_probe(AVProbeData *p)
	55	{
	56	/* we need at least 57 bytes from the header
	57	* to try parsing all required fields
	58	*/
	59	if (p->buf_size < 57)
	60	return 0;
	61
	62	/* Magic is 'AMV' */
	63	if (p->buf != 'A' \|\| (p->buf + 1) != 'M' \|\| *(p->buf + 2) != 'V')
	64	return 0;
	65
	66	/* Audio magic is always MP3 */
	67	if (p->buf[43] != 'M' \|\| p->buf[44] != 'P' \|\| p->buf[45] != '3')
	68	return 0;
	69
	70	/* Check for nonzero in bpp and (width\|height) header fields */
	71	if(!(p->buf[51] && AV_RL16(&p->buf[52]) \| AV_RL16(&p->buf[54])))
	72	return 0;
	73
	74	/* If width or height are 0 then imagesize header field should not */
	75	if(!AV_RL16(&p->buf[52]) \|\| !AV_RL16(&p->buf[54]))
	76	{
	77	if(!!AV_RL16(&p->buf[56]))
	78	return AVPROBE_SCORE_EXTENSION;
	79	else
	80	return 0;
	81	}
	82
	83	/* Image bpp is not an absolutely required
	84	* field as we latter claim it should be 16
	85	* no matter what. All samples in the wild
	86	* are RGB565/555.
	87	*/
	88	if(p->buf[51] != MTV_IMAGE_DEFAULT_BPP)
	89	return AVPROBE_SCORE_EXTENSION / 2;
	90
	91	/* We had enough data to parse header values
	92	* but we expect to be able to get 512 bytes
	93	* of header to be sure.
	94	*/
	95	if (p->buf_size < MTV_HEADER_SIZE)
	96	return AVPROBE_SCORE_EXTENSION;
	97
	98	return AVPROBE_SCORE_MAX;
	99	}
	100
	101	static int mtv_read_header(AVFormatContext *s)
	102	{
	103	MTVDemuxContext *mtv = s->priv_data;
	104	AVIOContext *pb = s->pb;
	105	AVStream *st;
	106	unsigned int audio_subsegments;
	107
	108	avio_skip(pb, 3);
	109	mtv->file_size = avio_rl32(pb);
	110	mtv->segments = avio_rl32(pb);
	111	avio_skip(pb, 32);
	112	mtv->audio_identifier = avio_rl24(pb);
	113	mtv->audio_br = avio_rl16(pb);
	114	mtv->img_colorfmt = avio_rl24(pb);
	115	mtv->img_bpp = avio_r8(pb);
	116	mtv->img_width = avio_rl16(pb);
	117	mtv->img_height = avio_rl16(pb);
	118	mtv->img_segment_size = avio_rl16(pb);
	119
	120	/* Assume 16bpp even if claimed otherwise.
	121	* We know its going to be RGBG565/555 anyway
	122	*/
	123	if (mtv->img_bpp != MTV_IMAGE_DEFAULT_BPP) {
	124	av_log (s, AV_LOG_WARNING, "Header claims %dbpp (!= 16). Ignoring\n",
	125	mtv->img_bpp);
	126	mtv->img_bpp = MTV_IMAGE_DEFAULT_BPP;
	127	}
	128
	129	/* Calculate width and height if missing from header */
	130
	131	if (!mtv->img_width && mtv->img_height > 0 && mtv->img_bpp >= 8)
	132	mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3)
	133	/ mtv->img_height;
	134
	135	if (!mtv->img_height && mtv->img_width > 0 && mtv->img_bpp >= 8)
	136	mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3)
	137	/ mtv->img_width;
	138
	139	if(!mtv->img_height \|\| !mtv->img_width \|\| !mtv->img_segment_size){
	140	av_log(s, AV_LOG_ERROR, "width or height or segment_size is invalid and I cannot calculate them from other information\n");
	141	return AVERROR_INVALIDDATA;
	142	}
	143
	144	avio_skip(pb, 4);
	145	audio_subsegments = avio_rl16(pb);
	146
	147	if (audio_subsegments == 0) {
	148	avpriv_request_sample(s, "MTV files without audio");
	149	return AVERROR_PATCHWELCOME;
	150	}
	151
	152	mtv->full_segment_size =
	153	audio_subsegments * (MTV_AUDIO_PADDING_SIZE + MTV_ASUBCHUNK_DATA_SIZE) +
	154	mtv->img_segment_size;
	155	mtv->video_fps = (mtv->audio_br / 4) / audio_subsegments;
	156
	157	// FIXME Add sanity check here
	158
	159	// all systems go! init decoders
	160
	161	// video - raw rgb565
	162
	163	st = avformat_new_stream(s, NULL);
	164	if(!st)
	165	return AVERROR(ENOMEM);
	166
	167	avpriv_set_pts_info(st, 64, 1, mtv->video_fps);
	168	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	169	st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
	170	st->codec->pix_fmt = AV_PIX_FMT_RGB565BE;
	171	st->codec->width = mtv->img_width;
	172	st->codec->height = mtv->img_height;
	173	st->codec->extradata = av_strdup("BottomUp");
	174	st->codec->extradata_size = 9;
	175
	176	// audio - mp3
	177
	178	st = avformat_new_stream(s, NULL);
	179	if(!st)
	180	return AVERROR(ENOMEM);
	181
	182	avpriv_set_pts_info(st, 64, 1, MTV_AUDIO_SAMPLING_RATE);
	183	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
	184	st->codec->codec_id = AV_CODEC_ID_MP3;
	185	st->codec->bit_rate = mtv->audio_br;
	186	st->need_parsing = AVSTREAM_PARSE_FULL;
	187
	188	// Jump over header
	189
	190	if(avio_seek(pb, MTV_HEADER_SIZE, SEEK_SET) != MTV_HEADER_SIZE)
	191	return AVERROR(EIO);
	192
	193	return 0;
	194
	195	}
	196
	197	static int mtv_read_packet(AVFormatContext s, AVPacket pkt)
	198	{
	199	MTVDemuxContext *mtv = s->priv_data;
	200	AVIOContext *pb = s->pb;
	201	int ret;
	202
	203	if((avio_tell(pb) - s->data_offset + mtv->img_segment_size) % mtv->full_segment_size)
	204	{
	205	avio_skip(pb, MTV_AUDIO_PADDING_SIZE);
	206
	207	ret = av_get_packet(pb, pkt, MTV_ASUBCHUNK_DATA_SIZE);
	208	if(ret < 0)
	209	return ret;
	210
	211	pkt->pos -= MTV_AUDIO_PADDING_SIZE;
	212	pkt->stream_index = 1;
	213
	214	}else
	215	{
	216	ret = av_get_packet(pb, pkt, mtv->img_segment_size);
	217	if(ret < 0)
	218	return ret;
	219
	220	pkt->stream_index = 0;
	221	}
	222
	223	return ret;
	224	}
	225
	226	AVInputFormat ff_mtv_demuxer = {
	227	.name = "mtv",
	228	.long_name = NULL_IF_CONFIG_SMALL("MTV"),
	229	.priv_data_size = sizeof(MTVDemuxContext),
	230	.read_probe = mtv_probe,
	231	.read_header = mtv_read_header,
	232	.read_packet = mtv_read_packet,
	233	};