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

/*
 * LXF demuxer
 * Copyright (c) 2010 Tomas Härdin
 *
 * 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 <inttypes.h>

#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"

#define LXF_MAX_PACKET_HEADER_SIZE 256
#define LXF_HEADER_DATA_SIZE    120
#define LXF_IDENT               "LEITCH\0"
#define LXF_IDENT_LENGTH        8
#define LXF_SAMPLERATE          48000

static const AVCodecTag lxf_tags[] = {
    { AV_CODEC_ID_MJPEG,       0 },
    { AV_CODEC_ID_MPEG1VIDEO,  1 },
    { AV_CODEC_ID_MPEG2VIDEO,  2 },    //MpMl, 4:2:0
    { AV_CODEC_ID_MPEG2VIDEO,  3 },    //MpPl, 4:2:2
    { AV_CODEC_ID_DVVIDEO,     4 },    //DV25
    { AV_CODEC_ID_DVVIDEO,     5 },    //DVCPRO
    { AV_CODEC_ID_DVVIDEO,     6 },    //DVCPRO50
    { AV_CODEC_ID_RAWVIDEO,    7 },    //AV_PIX_FMT_ARGB, where alpha is used for chroma keying
    { AV_CODEC_ID_RAWVIDEO,    8 },    //16-bit chroma key
    { AV_CODEC_ID_MPEG2VIDEO,  9 },    //4:2:2 CBP ("Constrained Bytes per Gop")
    { AV_CODEC_ID_NONE,        0 },
};

typedef struct {
    int channels;                       ///< number of audio channels. zero means no audio
    int frame_number;                   ///< current video frame
    uint32_t video_format, packet_type, extended_size;
} LXFDemuxContext;

static int lxf_probe(AVProbeData *p)
{
    if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH))
        return AVPROBE_SCORE_MAX;

    return 0;
}

/**
 * Verify the checksum of an LXF packet header
 *
 * @param[in] header the packet header to check
 * @return zero if the checksum is OK, non-zero otherwise
 */
static int check_checksum(const uint8_t *header, int size)
{
    int x;
    uint32_t sum = 0;

    for (x = 0; x < size; x += 4)
        sum += AV_RL32(&header[x]);

    return sum;
}

/**
 * Read input until we find the next ident. If found, copy it to the header buffer
 *
 * @param[out] header where to copy the ident to
 * @return 0 if an ident was found, < 0 on I/O error
 */
static int sync(AVFormatContext *s, uint8_t *header)
{
    uint8_t buf[LXF_IDENT_LENGTH];
    int ret;

    if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH)
        return ret < 0 ? ret : AVERROR_EOF;

    while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) {
        if (avio_feof(s->pb))
            return AVERROR_EOF;

        memmove(buf, &buf[1], LXF_IDENT_LENGTH-1);
        buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb);
    }

    memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH);

    return 0;
}

/**
 * Read and checksum the next packet header
 *
 * @return the size of the payload following the header or < 0 on failure
 */
static int get_packet_header(AVFormatContext *s)
{
    LXFDemuxContext *lxf = s->priv_data;
    AVIOContext   *pb  = s->pb;
    int track_size, samples, ret;
    uint32_t version, audio_format, header_size, channels, tmp;
    AVStream *st;
    uint8_t header[LXF_MAX_PACKET_HEADER_SIZE];
    const uint8_t *p = header + LXF_IDENT_LENGTH;

    //find and read the ident
    if ((ret = sync(s, header)) < 0)
        return ret;

    ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8);
    if (ret != 8)
        return ret < 0 ? ret : AVERROR_EOF;

    version     = bytestream_get_le32(&p);
    header_size = bytestream_get_le32(&p);
    if (version > 1)
        avpriv_request_sample(s, "Unknown format version %"PRIu32"\n", version);

    if (header_size < (version ? 72 : 60) ||
        header_size > LXF_MAX_PACKET_HEADER_SIZE ||
        (header_size & 3)) {
        av_log(s, AV_LOG_ERROR, "Invalid header size 0x%"PRIx32"\n", header_size);
        return AVERROR_INVALIDDATA;
    }

    //read the rest of the packet header
    if ((ret = avio_read(pb, header + (p - header),
                          header_size - (p - header))) !=
                          header_size - (p - header))
        return ret < 0 ? ret : AVERROR_EOF;

    if (check_checksum(header, header_size))
        av_log(s, AV_LOG_ERROR, "checksum error\n");

    lxf->packet_type = bytestream_get_le32(&p);
    p += version ? 20 : 12;

    lxf->extended_size = 0;
    switch (lxf->packet_type) {
    case 0:
        //video
        lxf->video_format = bytestream_get_le32(&p);
        ret               = bytestream_get_le32(&p);
        //skip VBI data and metadata
        avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) +
                      (int64_t)(uint32_t)AV_RL32(p + 12));
        break;
    case 1:
        //audio
        if (s->nb_streams < 2) {
            av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n");
            break;
        }

        if (version == 0)
            p += 8;
        audio_format = bytestream_get_le32(&p);
        channels     = bytestream_get_le32(&p);
        track_size   = bytestream_get_le32(&p);

        st = s->streams[1];

        //set codec based on specified audio bitdepth
        //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
        st->codec->bits_per_coded_sample = (audio_format >> 6) & 0x3F;

        if (st->codec->bits_per_coded_sample != (audio_format & 0x3F)) {
            av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n");
            return AVERROR_PATCHWELCOME;
        }

        switch (st->codec->bits_per_coded_sample) {
        case 16: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
        case 20: st->codec->codec_id = AV_CODEC_ID_PCM_LXF;   break;
        case 24: st->codec->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break;
        case 32: st->codec->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break;
        default:
            av_log(s, AV_LOG_WARNING,
                   "only 16-, 20-, 24- and 32-bit PCM currently supported\n");
            return AVERROR_PATCHWELCOME;
        }

        samples = track_size * 8 / st->codec->bits_per_coded_sample;

        //use audio packet size to determine video standard
        //for NTSC we have one 8008-sample audio frame per five video frames
        if (samples == LXF_SAMPLERATE * 5005 / 30000) {
            avpriv_set_pts_info(s->streams[0], 64, 1001, 30000);
        } else {
            //assume PAL, but warn if we don't have 1920 samples
            if (samples != LXF_SAMPLERATE / 25)
                av_log(s, AV_LOG_WARNING,
                       "video doesn't seem to be PAL or NTSC. guessing PAL\n");

            avpriv_set_pts_info(s->streams[0], 64, 1, 25);
        }

        //TODO: warning if track mask != (1 << channels) - 1?
        ret = av_popcount(channels) * track_size;

        break;
    default:
        tmp = bytestream_get_le32(&p);
        ret = bytestream_get_le32(&p);
        if (tmp == 1)
            lxf->extended_size = bytestream_get_le32(&p);
        break;
    }

    return ret;
}

static int lxf_read_header(AVFormatContext *s)
{
    LXFDemuxContext *lxf = s->priv_data;
    AVIOContext   *pb  = s->pb;
    uint8_t header_data[LXF_HEADER_DATA_SIZE];
    int ret;
    AVStream *st;
    uint32_t video_params, disk_params;
    uint16_t record_date, expiration_date;

    if ((ret = get_packet_header(s)) < 0)
        return ret;

    if (ret != LXF_HEADER_DATA_SIZE) {
        av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n",
               LXF_HEADER_DATA_SIZE, ret);
        return AVERROR_INVALIDDATA;
    }

    if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE)
        return ret < 0 ? ret : AVERROR_EOF;

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

    st->duration          = AV_RL32(&header_data[32]);
    video_params          = AV_RL32(&header_data[40]);
    record_date           = AV_RL16(&header_data[56]);
    expiration_date       = AV_RL16(&header_data[58]);
    disk_params           = AV_RL32(&header_data[116]);

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codec->bit_rate   = 1000000 * ((video_params >> 14) & 0xFF);
    st->codec->codec_tag  = video_params & 0xF;
    st->codec->codec_id   = ff_codec_get_id(lxf_tags, st->codec->codec_tag);
    st->need_parsing      = AVSTREAM_PARSE_HEADERS;

    av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n",
           record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
           (record_date >> 11) & 0x1F);

    av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n",
           expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
           (expiration_date >> 11) & 0x1F);

    if ((video_params >> 22) & 1)
        av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n");

    if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) {
        if (!(st = avformat_new_stream(s, NULL)))
            return AVERROR(ENOMEM);

        st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
        st->codec->sample_rate = LXF_SAMPLERATE;
        st->codec->channels    = lxf->channels;

        avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
    }

    avio_skip(s->pb, lxf->extended_size);

    return 0;
}

static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    LXFDemuxContext *lxf = s->priv_data;
    AVIOContext   *pb  = s->pb;
    uint32_t stream;
    int ret, ret2;

    if ((ret = get_packet_header(s)) < 0)
        return ret;

    stream = lxf->packet_type;

    if (stream > 1) {
        av_log(s, AV_LOG_WARNING,
               "got packet with illegal stream index %"PRIu32"\n", stream);
        return AVERROR(EAGAIN);
    }

    if (stream == 1 && s->nb_streams < 2) {
        av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n");
        return AVERROR_INVALIDDATA;
    }

    if ((ret2 = av_new_packet(pkt, ret)) < 0)
        return ret2;

    if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) {
        av_free_packet(pkt);
        return ret2 < 0 ? ret2 : AVERROR_EOF;
    }

    pkt->stream_index = stream;

    if (!stream) {
        //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
        if (((lxf->video_format >> 22) & 0x3) < 2)
            pkt->flags |= AV_PKT_FLAG_KEY;

        pkt->dts = lxf->frame_number++;
    }

    return ret;
}

AVInputFormat ff_lxf_demuxer = {
    .name           = "lxf",
    .long_name      = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"),
    .priv_data_size = sizeof(LXFDemuxContext),
    .read_probe     = lxf_probe,
    .read_header    = lxf_read_header,
    .read_packet    = lxf_read_packet,
    .codec_tag      = (const AVCodecTag* const []){lxf_tags, 0},
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* LXF demuxer
	3	* Copyright (c) 2010 Tomas Härdin
	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 <inttypes.h>
	23
	24	#include "libavutil/intreadwrite.h"
	25	#include "libavcodec/bytestream.h"
	26	#include "avformat.h"
	27	#include "internal.h"
	28
	29	#define LXF_MAX_PACKET_HEADER_SIZE 256
	30	#define LXF_HEADER_DATA_SIZE 120
	31	#define LXF_IDENT "LEITCH\0"
	32	#define LXF_IDENT_LENGTH 8
	33	#define LXF_SAMPLERATE 48000
	34
	35	static const AVCodecTag lxf_tags[] = {
	36	{ AV_CODEC_ID_MJPEG, 0 },
	37	{ AV_CODEC_ID_MPEG1VIDEO, 1 },
	38	{ AV_CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0
	39	{ AV_CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2
	40	{ AV_CODEC_ID_DVVIDEO, 4 }, //DV25
	41	{ AV_CODEC_ID_DVVIDEO, 5 }, //DVCPRO
	42	{ AV_CODEC_ID_DVVIDEO, 6 }, //DVCPRO50
	43	{ AV_CODEC_ID_RAWVIDEO, 7 }, //AV_PIX_FMT_ARGB, where alpha is used for chroma keying
	44	{ AV_CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key
	45	{ AV_CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop")
	46	{ AV_CODEC_ID_NONE, 0 },
	47	};
	48
	49	typedef struct {
	50	int channels; ///< number of audio channels. zero means no audio
	51	int frame_number; ///< current video frame
	52	uint32_t video_format, packet_type, extended_size;
	53	} LXFDemuxContext;
	54
	55	static int lxf_probe(AVProbeData *p)
	56	{
	57	if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH))
	58	return AVPROBE_SCORE_MAX;
	59
	60	return 0;
	61	}
	62
	63	/**
	64	* Verify the checksum of an LXF packet header
65	*
66	* @param[in] header the packet header to check
67	* @return zero if the checksum is OK, non-zero otherwise
68	*/
69	static int check_checksum(const uint8_t *header, int size)
70	{
71	int x;
72	uint32_t sum = 0;
73
74	for (x = 0; x < size; x += 4)
75	sum += AV_RL32(&header[x]);
76
77	return sum;
78	}
79
80	/**
81	* Read input until we find the next ident. If found, copy it to the header buffer
82	*
83	* @param[out] header where to copy the ident to
84	* @return 0 if an ident was found, < 0 on I/O error
85	*/
86	static int sync(AVFormatContext s, uint8_t header)
87	{
88	uint8_t buf[LXF_IDENT_LENGTH];
89	int ret;
90
91	if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH)
92	return ret < 0 ? ret : AVERROR_EOF;
93
94	while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) {
95	if (avio_feof(s->pb))
96	return AVERROR_EOF;
97
98	memmove(buf, &buf[1], LXF_IDENT_LENGTH-1);
99	buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb);
100	}
101
102	memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH);
103
104	return 0;
105	}
106
107	/**
108	* Read and checksum the next packet header
109	*
110	* @return the size of the payload following the header or < 0 on failure
111	*/
112	static int get_packet_header(AVFormatContext *s)
113	{
114	LXFDemuxContext *lxf = s->priv_data;
115	AVIOContext *pb = s->pb;
116	int track_size, samples, ret;
117	uint32_t version, audio_format, header_size, channels, tmp;
118	AVStream *st;
119	uint8_t header[LXF_MAX_PACKET_HEADER_SIZE];
120	const uint8_t *p = header + LXF_IDENT_LENGTH;
121
122	//find and read the ident
123	if ((ret = sync(s, header)) < 0)
124	return ret;
125
126	ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8);
127	if (ret != 8)
128	return ret < 0 ? ret : AVERROR_EOF;
129
130	version = bytestream_get_le32(&p);
131	header_size = bytestream_get_le32(&p);
132	if (version > 1)
133	avpriv_request_sample(s, "Unknown format version %"PRIu32"\n", version);
134
135	if (header_size < (version ? 72 : 60) \|\|
136	header_size > LXF_MAX_PACKET_HEADER_SIZE \|\|
137	(header_size & 3)) {
138	av_log(s, AV_LOG_ERROR, "Invalid header size 0x%"PRIx32"\n", header_size);
139	return AVERROR_INVALIDDATA;
140	}
141
142	//read the rest of the packet header
143	if ((ret = avio_read(pb, header + (p - header),
144	header_size - (p - header))) !=
145	header_size - (p - header))
146	return ret < 0 ? ret : AVERROR_EOF;
147
148	if (check_checksum(header, header_size))
149	av_log(s, AV_LOG_ERROR, "checksum error\n");
150
151	lxf->packet_type = bytestream_get_le32(&p);
152	p += version ? 20 : 12;
153
154	lxf->extended_size = 0;
155	switch (lxf->packet_type) {
156	case 0:
157	//video
158	lxf->video_format = bytestream_get_le32(&p);
159	ret = bytestream_get_le32(&p);
160	//skip VBI data and metadata
161	avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) +
162	(int64_t)(uint32_t)AV_RL32(p + 12));
163	break;
164	case 1:
165	//audio
166	if (s->nb_streams < 2) {
167	av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n");
168	break;
169	}
170
171	if (version == 0)
172	p += 8;
173	audio_format = bytestream_get_le32(&p);
174	channels = bytestream_get_le32(&p);
175	track_size = bytestream_get_le32(&p);
176
177	st = s->streams[1];
178
179	//set codec based on specified audio bitdepth
180	//we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
181	st->codec->bits_per_coded_sample = (audio_format >> 6) & 0x3F;
182
183	if (st->codec->bits_per_coded_sample != (audio_format & 0x3F)) {
184	av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n");
185	return AVERROR_PATCHWELCOME;
186	}
187
188	switch (st->codec->bits_per_coded_sample) {
189	case 16: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
190	case 20: st->codec->codec_id = AV_CODEC_ID_PCM_LXF; break;
191	case 24: st->codec->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break;
192	case 32: st->codec->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break;
193	default:
194	av_log(s, AV_LOG_WARNING,
195	"only 16-, 20-, 24- and 32-bit PCM currently supported\n");
196	return AVERROR_PATCHWELCOME;
197	}
198
199	samples = track_size * 8 / st->codec->bits_per_coded_sample;
200
201	//use audio packet size to determine video standard
202	//for NTSC we have one 8008-sample audio frame per five video frames
203	if (samples == LXF_SAMPLERATE * 5005 / 30000) {
204	avpriv_set_pts_info(s->streams[0], 64, 1001, 30000);
205	} else {
206	//assume PAL, but warn if we don't have 1920 samples
207	if (samples != LXF_SAMPLERATE / 25)
208	av_log(s, AV_LOG_WARNING,
209	"video doesn't seem to be PAL or NTSC. guessing PAL\n");
210
211	avpriv_set_pts_info(s->streams[0], 64, 1, 25);
212	}
213
214	//TODO: warning if track mask != (1 << channels) - 1?
215	ret = av_popcount(channels) * track_size;
216
217	break;
218	default:
219	tmp = bytestream_get_le32(&p);
220	ret = bytestream_get_le32(&p);
221	if (tmp == 1)
222	lxf->extended_size = bytestream_get_le32(&p);
223	break;
224	}
225
226	return ret;
227	}
228
229	static int lxf_read_header(AVFormatContext *s)
230	{
231	LXFDemuxContext *lxf = s->priv_data;
232	AVIOContext *pb = s->pb;
233	uint8_t header_data[LXF_HEADER_DATA_SIZE];
234	int ret;
235	AVStream *st;
236	uint32_t video_params, disk_params;
237	uint16_t record_date, expiration_date;
238
239	if ((ret = get_packet_header(s)) < 0)
240	return ret;
241
242	if (ret != LXF_HEADER_DATA_SIZE) {
243	av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n",
244	LXF_HEADER_DATA_SIZE, ret);
245	return AVERROR_INVALIDDATA;
246	}
247
248	if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE)
249	return ret < 0 ? ret : AVERROR_EOF;
250
251	if (!(st = avformat_new_stream(s, NULL)))
252	return AVERROR(ENOMEM);
253
254	st->duration = AV_RL32(&header_data[32]);
255	video_params = AV_RL32(&header_data[40]);
256	record_date = AV_RL16(&header_data[56]);
257	expiration_date = AV_RL16(&header_data[58]);
258	disk_params = AV_RL32(&header_data[116]);
259
260	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
261	st->codec->bit_rate = 1000000 * ((video_params >> 14) & 0xFF);
262	st->codec->codec_tag = video_params & 0xF;
263	st->codec->codec_id = ff_codec_get_id(lxf_tags, st->codec->codec_tag);
264	st->need_parsing = AVSTREAM_PARSE_HEADERS;
265
266	av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n",
267	record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
268	(record_date >> 11) & 0x1F);
269
270	av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n",
271	expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
272	(expiration_date >> 11) & 0x1F);
273
274	if ((video_params >> 22) & 1)
275	av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n");
276
277	if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) {
278	if (!(st = avformat_new_stream(s, NULL)))
279	return AVERROR(ENOMEM);
280
281	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
282	st->codec->sample_rate = LXF_SAMPLERATE;
283	st->codec->channels = lxf->channels;
284
285	avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
286	}
287
288	avio_skip(s->pb, lxf->extended_size);
289
290	return 0;
291	}
292
293	static int lxf_read_packet(AVFormatContext s, AVPacket pkt)
294	{
295	LXFDemuxContext *lxf = s->priv_data;
296	AVIOContext *pb = s->pb;
297	uint32_t stream;
298	int ret, ret2;
299
300	if ((ret = get_packet_header(s)) < 0)
301	return ret;
302
303	stream = lxf->packet_type;
304
305	if (stream > 1) {
306	av_log(s, AV_LOG_WARNING,
307	"got packet with illegal stream index %"PRIu32"\n", stream);
308	return AVERROR(EAGAIN);
309	}
310
311	if (stream == 1 && s->nb_streams < 2) {
312	av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n");
313	return AVERROR_INVALIDDATA;
314	}
315
316	if ((ret2 = av_new_packet(pkt, ret)) < 0)
317	return ret2;
318
319	if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) {
320	av_free_packet(pkt);
321	return ret2 < 0 ? ret2 : AVERROR_EOF;
322	}
323
324	pkt->stream_index = stream;
325
326	if (!stream) {
327	//picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
328	if (((lxf->video_format >> 22) & 0x3) < 2)
329	pkt->flags \|= AV_PKT_FLAG_KEY;
330
331	pkt->dts = lxf->frame_number++;
332	}
333
334	return ret;
335	}
336
337	AVInputFormat ff_lxf_demuxer = {
338	.name = "lxf",
339	.long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"),
340	.priv_data_size = sizeof(LXFDemuxContext),
341	.read_probe = lxf_probe,
342	.read_header = lxf_read_header,
343	.read_packet = lxf_read_packet,
344	.codec_tag = (const AVCodecTag* const []){lxf_tags, 0},
345	};