WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/libavformat/rmdec.c

Rev	Author	Line No.	Line
4349	Serge	1	/*
		2	* "Real" compatible demuxer.
		3	* Copyright (c) 2000, 2001 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 "libavutil/avassert.h"
		23	#include "libavutil/avstring.h"
		24	#include "libavutil/channel_layout.h"
		25	#include "libavutil/internal.h"
		26	#include "libavutil/intreadwrite.h"
		27	#include "libavutil/dict.h"
		28	#include "avformat.h"
		29	#include "avio_internal.h"
		30	#include "internal.h"
		31	#include "rmsipr.h"
		32	#include "rm.h"
		33
		34	#define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/ATRAC
		35	#define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
		36	#define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
		37	#define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
		38	#define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
		39	#define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC
		40
		41	struct RMStream {
		42	AVPacket pkt; ///< place to store merged video frame / reordered audio data
		43	int videobufsize; ///< current assembled frame size
		44	int videobufpos; ///< position for the next slice in the video buffer
		45	int curpic_num; ///< picture number of current frame
		46	int cur_slice, slices;
		47	int64_t pktpos; ///< first slice position in file
		48	/// Audio descrambling matrix parameters
		49	int64_t audiotimestamp; ///< Audio packet timestamp
		50	int sub_packet_cnt; // Subpacket counter, used while reading
		51	int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
		52	int audio_framesize; /// Audio frame size from container
		53	int sub_packet_lengths[16]; /// Length of each subpacket
		54	int32_t deint_id; ///< deinterleaver used in audio stream
		55	};
		56
		57	typedef struct {
		58	int nb_packets;
		59	int old_format;
		60	int current_stream;
		61	int remaining_len;
		62	int audio_stream_num; ///< Stream number for audio packets
		63	int audio_pkt_cnt; ///< Output packet counter
		64	} RMDemuxContext;
		65
		66	static inline void get_strl(AVIOContext pb, char buf, int buf_size, int len)
		67	{
		68	int i;
		69	char *q, r;
		70
		71	q = buf;
		72	for(i=0;i
		73	r = avio_r8(pb);
		74	if (i < buf_size - 1)
		75	*q++ = r;
		76	}
		77	if (buf_size > 0) *q = '\0';
		78	}
		79
		80	static void get_str8(AVIOContext pb, char buf, int buf_size)
		81	{
		82	get_strl(pb, buf, buf_size, avio_r8(pb));
		83	}
		84
		85	static int rm_read_extradata(AVIOContext pb, AVCodecContext avctx, unsigned size)
		86	{
		87	if (size >= 1<<24)
		88	return -1;
		89	if (ff_alloc_extradata(avctx, size))
		90	return AVERROR(ENOMEM);
		91	avctx->extradata_size = avio_read(pb, avctx->extradata, size);
		92	if (avctx->extradata_size != size)
		93	return AVERROR(EIO);
		94	return 0;
		95	}
		96
		97	static void rm_read_metadata(AVFormatContext s, AVIOContext pb, int wide)
		98	{
		99	char buf[1024];
		100	int i;
		101
		102	for (i=0; i
		103	int len = wide ? avio_rb16(pb) : avio_r8(pb);
		104	get_strl(pb, buf, sizeof(buf), len);
		105	av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
		106	}
		107	}
		108
		109	RMStream *ff_rm_alloc_rmstream (void)
		110	{
		111	RMStream *rms = av_mallocz(sizeof(RMStream));
		112	rms->curpic_num = -1;
		113	return rms;
		114	}
		115
		116	void ff_rm_free_rmstream (RMStream *rms)
		117	{
		118	av_free_packet(&rms->pkt);
		119	}
		120
		121	static int rm_read_audio_stream_info(AVFormatContext s, AVIOContext pb,
		122	AVStream st, RMStream ast, int read_all)
		123	{
		124	char buf[256];
		125	uint32_t version;
		126	int ret;
		127
		128	/* ra type header */
		129	version = avio_rb16(pb); /* version */
		130	if (version == 3) {
		131	unsigned bytes_per_minute;
		132	int header_size = avio_rb16(pb);
		133	int64_t startpos = avio_tell(pb);
		134	avio_skip(pb, 8);
		135	bytes_per_minute = avio_rb16(pb);
		136	avio_skip(pb, 4);
		137	rm_read_metadata(s, pb, 0);
		138	if ((startpos + header_size) >= avio_tell(pb) + 2) {
		139	// fourcc (should always be "lpcJ")
		140	avio_r8(pb);
		141	get_str8(pb, buf, sizeof(buf));
		142	}
		143	// Skip extra header crap (this should never happen)
		144	if ((startpos + header_size) > avio_tell(pb))
		145	avio_skip(pb, header_size + startpos - avio_tell(pb));
		146	if (bytes_per_minute)
		147	st->codec->bit_rate = 8LL * bytes_per_minute / 60;
		148	st->codec->sample_rate = 8000;
		149	st->codec->channels = 1;
		150	st->codec->channel_layout = AV_CH_LAYOUT_MONO;
		151	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
		152	st->codec->codec_id = AV_CODEC_ID_RA_144;
		153	ast->deint_id = DEINT_ID_INT0;
		154	} else {
		155	int flavor, sub_packet_h, coded_framesize, sub_packet_size;
		156	int codecdata_length;
		157	unsigned bytes_per_minute;
		158	/* old version (4) */
		159	avio_skip(pb, 2); /* unused */
		160	avio_rb32(pb); /* .ra4 */
		161	avio_rb32(pb); /* data size */
		162	avio_rb16(pb); /* version2 */
		163	avio_rb32(pb); /* header size */
		164	flavor= avio_rb16(pb); /* add codec info / flavor */
		165	ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
		166	avio_rb32(pb); /* ??? */
		167	bytes_per_minute = avio_rb32(pb);
		168	if (version == 4) {
		169	if (bytes_per_minute)
		170	st->codec->bit_rate = 8LL * bytes_per_minute / 60;
		171	}
		172	avio_rb32(pb); /* ??? */
		173	ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
		174	st->codec->block_align= avio_rb16(pb); /* frame size */
		175	ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
		176	avio_rb16(pb); /* ??? */
		177	if (version == 5) {
		178	avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
		179	}
		180	st->codec->sample_rate = avio_rb16(pb);
		181	avio_rb32(pb);
		182	st->codec->channels = avio_rb16(pb);
		183	if (version == 5) {
		184	ast->deint_id = avio_rl32(pb);
		185	avio_read(pb, buf, 4);
		186	buf[4] = 0;
		187	} else {
		188	get_str8(pb, buf, sizeof(buf)); /* desc */
		189	ast->deint_id = AV_RL32(buf);
		190	get_str8(pb, buf, sizeof(buf)); /* desc */
		191	}
		192	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
		193	st->codec->codec_tag = AV_RL32(buf);
		194	st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
		195	st->codec->codec_tag);
		196
		197	switch (st->codec->codec_id) {
		198	case AV_CODEC_ID_AC3:
		199	st->need_parsing = AVSTREAM_PARSE_FULL;
		200	break;
		201	case AV_CODEC_ID_RA_288:
		202	st->codec->extradata_size= 0;
		203	ast->audio_framesize = st->codec->block_align;
		204	st->codec->block_align = coded_framesize;
		205	break;
		206	case AV_CODEC_ID_COOK:
		207	st->need_parsing = AVSTREAM_PARSE_HEADERS;
		208	case AV_CODEC_ID_ATRAC3:
		209	case AV_CODEC_ID_SIPR:
		210	if (read_all) {
		211	codecdata_length = 0;
		212	} else {
		213	avio_rb16(pb); avio_r8(pb);
		214	if (version == 5)
		215	avio_r8(pb);
		216	codecdata_length = avio_rb32(pb);
		217	if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
		218	av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
		219	return -1;
		220	}
		221	}
		222
		223	ast->audio_framesize = st->codec->block_align;
		224	if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
		225	if (flavor > 3) {
		226	av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
		227	flavor);
		228	return -1;
		229	}
		230	st->codec->block_align = ff_sipr_subpk_size[flavor];
		231	} else {
		232	if(sub_packet_size <= 0){
		233	av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
		234	return -1;
		235	}
		236	st->codec->block_align = ast->sub_packet_size;
		237	}
		238	if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
		239	return ret;
		240
		241	break;
		242	case AV_CODEC_ID_AAC:
		243	avio_rb16(pb); avio_r8(pb);
		244	if (version == 5)
		245	avio_r8(pb);
		246	codecdata_length = avio_rb32(pb);
		247	if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
		248	av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
		249	return -1;
		250	}
		251	if (codecdata_length >= 1) {
		252	avio_r8(pb);
		253	if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
		254	return ret;
		255	}
		256	break;
		257	default:
		258	av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
		259	}
		260	if (ast->deint_id == DEINT_ID_INT4 \|\|
		261	ast->deint_id == DEINT_ID_GENR \|\|
		262	ast->deint_id == DEINT_ID_SIPR) {
		263	if (st->codec->block_align <= 0 \|\|
		264	ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX \|\|
		265	ast->audio_framesize * sub_packet_h < st->codec->block_align)
		266	return AVERROR_INVALIDDATA;
		267	if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
		268	return AVERROR(ENOMEM);
		269	}
		270	switch (ast->deint_id) {
		271	case DEINT_ID_INT4:
		272	if (ast->coded_framesize > ast->audio_framesize \|\|
		273	sub_packet_h <= 1 \|\|
		274	ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
		275	return AVERROR_INVALIDDATA;
		276	break;
		277	case DEINT_ID_GENR:
		278	if (ast->sub_packet_size <= 0 \|\|
		279	ast->sub_packet_size > ast->audio_framesize)
		280	return AVERROR_INVALIDDATA;
		281	break;
		282	case DEINT_ID_SIPR:
		283	case DEINT_ID_INT0:
		284	case DEINT_ID_VBRS:
		285	case DEINT_ID_VBRF:
		286	break;
		287	default:
		288	av_log(s, AV_LOG_ERROR, "Unknown interleaver %X\n", ast->deint_id);
		289	return AVERROR_INVALIDDATA;
		290	}
		291
		292	if (read_all) {
		293	avio_r8(pb);
		294	avio_r8(pb);
		295	avio_r8(pb);
		296	rm_read_metadata(s, pb, 0);
		297	}
		298	}
		299	return 0;
		300	}
		301
		302	int
		303	ff_rm_read_mdpr_codecdata (AVFormatContext s, AVIOContext pb,
		304	AVStream st, RMStream rst, int codec_data_size, const uint8_t *mime)
		305	{
		306	unsigned int v;
		307	int size;
		308	int64_t codec_pos;
		309	int ret;
		310
		311	avpriv_set_pts_info(st, 64, 1, 1000);
		312	codec_pos = avio_tell(pb);
		313	v = avio_rb32(pb);
		314	if (v == MKTAG(0xfd, 'a', 'r', '.')) {
		315	/* ra type header */
		316	if (rm_read_audio_stream_info(s, pb, st, rst, 0))
		317	return -1;
		318	} else if (v == MKBETAG('L', 'S', 'D', ':')) {
		319	avio_seek(pb, -4, SEEK_CUR);
		320	if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)
		321	return ret;
		322
		323	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
		324	st->codec->codec_tag = AV_RL32(st->codec->extradata);
		325	st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
		326	st->codec->codec_tag);
		327	} else if(mime && !strcmp(mime, "logical-fileinfo")){
		328	int stream_count, rule_count, property_count, i;
		329	ff_free_stream(s, st);
		330	if (avio_rb16(pb) != 0) {
		331	av_log(s, AV_LOG_WARNING, "Unsupported version\n");
		332	goto skip;
		333	}
		334	stream_count = avio_rb16(pb);
		335	avio_skip(pb, 6*stream_count);
		336	rule_count = avio_rb16(pb);
		337	avio_skip(pb, 2*rule_count);
		338	property_count = avio_rb16(pb);
		339	for(i=0; i
		340	uint8_t name[128], val[128];
		341	avio_rb32(pb);
		342	if (avio_rb16(pb) != 0) {
		343	av_log(s, AV_LOG_WARNING, "Unsupported Name value property version\n");
		344	goto skip; //FIXME skip just this one
		345	}
		346	get_str8(pb, name, sizeof(name));
		347	switch(avio_rb32(pb)) {
		348	case 2: get_strl(pb, val, sizeof(val), avio_rb16(pb));
		349	av_dict_set(&s->metadata, name, val, 0);
		350	break;
		351	default: avio_skip(pb, avio_rb16(pb));
		352	}
		353	}
		354	} else {
		355	int fps;
		356	if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
		357	fail1:
		358	av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);
		359	goto skip;
		360	}
		361	st->codec->codec_tag = avio_rl32(pb);
		362	st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
		363	st->codec->codec_tag);
		364	av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
		365	if (st->codec->codec_id == AV_CODEC_ID_NONE)
		366	goto fail1;
		367	st->codec->width = avio_rb16(pb);
		368	st->codec->height = avio_rb16(pb);
		369	avio_skip(pb, 2); // looks like bits per sample
		370	avio_skip(pb, 4); // always zero?
		371	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
		372	st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
		373	fps = avio_rb32(pb);
		374
		375	if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
		376	return ret;
		377
		378	if (fps > 0) {
		379	av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,
		380	0x10000, fps, (1 << 30) - 1);
		381	#if FF_API_R_FRAME_RATE
		382	st->r_frame_rate = st->avg_frame_rate;
		383	#endif
		384	} else if (s->error_recognition & AV_EF_EXPLODE) {
		385	av_log(s, AV_LOG_ERROR, "Invalid framerate\n");
		386	return AVERROR_INVALIDDATA;
		387	}
		388	}
		389
		390	skip:
		391	/* skip codec info */
		392	size = avio_tell(pb) - codec_pos;
		393	avio_skip(pb, codec_data_size - size);
		394
		395	return 0;
		396	}
		397
		398	/** this function assumes that the demuxer has already seeked to the start
		399	* of the INDX chunk, and will bail out if not. */
		400	static int rm_read_index(AVFormatContext *s)
		401	{
		402	AVIOContext *pb = s->pb;
		403	unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
		404	AVStream *st;
		405
		406	do {
		407	if (avio_rl32(pb) != MKTAG('I','N','D','X'))
		408	return -1;
		409	size = avio_rb32(pb);
		410	if (size < 20)
		411	return -1;
		412	avio_skip(pb, 2);
		413	n_pkts = avio_rb32(pb);
		414	str_id = avio_rb16(pb);
		415	next_off = avio_rb32(pb);
		416	for (n = 0; n < s->nb_streams; n++)
		417	if (s->streams[n]->id == str_id) {
		418	st = s->streams[n];
		419	break;
		420	}
		421	if (n == s->nb_streams) {
		422	av_log(s, AV_LOG_ERROR,
		423	"Invalid stream index %d for index at pos %"PRId64"\n",
		424	str_id, avio_tell(pb));
		425	goto skip;
		426	} else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
		427	av_log(s, AV_LOG_ERROR,
		428	"Nr. of packets in packet index for stream index %d "
		429	"exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
		430	str_id, avio_size(pb), avio_tell(pb),
		431	(avio_size(pb) - avio_tell(pb)) / 14);
		432	goto skip;
		433	}
		434
		435	for (n = 0; n < n_pkts; n++) {
		436	avio_skip(pb, 2);
		437	pts = avio_rb32(pb);
		438	pos = avio_rb32(pb);
		439	avio_skip(pb, 4); /* packet no. */
		440
		441	av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
		442	}
		443
		444	skip:
		445	if (next_off && avio_tell(pb) < next_off &&
		446	avio_seek(pb, next_off, SEEK_SET) < 0) {
		447	av_log(s, AV_LOG_ERROR,
		448	"Non-linear index detected, not supported\n");
		449	return -1;
		450	}
		451	} while (next_off);
		452
		453	return 0;
		454	}
		455
		456	static int rm_read_header_old(AVFormatContext *s)
		457	{
		458	RMDemuxContext *rm = s->priv_data;
		459	AVStream *st;
		460
		461	rm->old_format = 1;
		462	st = avformat_new_stream(s, NULL);
		463	if (!st)
		464	return -1;
		465	st->priv_data = ff_rm_alloc_rmstream();
		466	return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
		467	}
		468
		469	static int rm_read_header(AVFormatContext *s)
		470	{
		471	RMDemuxContext *rm = s->priv_data;
		472	AVStream *st;
		473	AVIOContext *pb = s->pb;
		474	unsigned int tag;
		475	int tag_size;
		476	unsigned int start_time, duration;
		477	unsigned int data_off = 0, indx_off = 0;
		478	char buf[128], mime[128];
		479	int flags = 0;
		480
		481	tag = avio_rl32(pb);
		482	if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
		483	/* very old .ra format */
		484	return rm_read_header_old(s);
		485	} else if (tag != MKTAG('.', 'R', 'M', 'F')) {
		486	return AVERROR(EIO);
		487	}
		488
		489	tag_size = avio_rb32(pb);
		490	avio_skip(pb, tag_size - 8);
		491
		492	for(;;) {
		493	if (url_feof(pb))
		494	return -1;
		495	tag = avio_rl32(pb);
		496	tag_size = avio_rb32(pb);
		497	avio_rb16(pb);
		498	av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
		499	(tag ) & 0xff,
		500	(tag >> 8) & 0xff,
		501	(tag >> 16) & 0xff,
		502	(tag >> 24) & 0xff,
		503	tag,
		504	tag_size);
		505	if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
		506	return -1;
		507	switch(tag) {
		508	case MKTAG('P', 'R', 'O', 'P'):
		509	/* file header */
		510	avio_rb32(pb); /* max bit rate */
		511	avio_rb32(pb); /* avg bit rate */
		512	avio_rb32(pb); /* max packet size */
		513	avio_rb32(pb); /* avg packet size */
		514	avio_rb32(pb); /* nb packets */
		515	duration = avio_rb32(pb); /* duration */
		516	s->duration = av_rescale(duration, AV_TIME_BASE, 1000);
		517	avio_rb32(pb); /* preroll */
		518	indx_off = avio_rb32(pb); /* index offset */
		519	data_off = avio_rb32(pb); /* data offset */
		520	avio_rb16(pb); /* nb streams */
		521	flags = avio_rb16(pb); /* flags */
		522	break;
		523	case MKTAG('C', 'O', 'N', 'T'):
		524	rm_read_metadata(s, pb, 1);
		525	break;
		526	case MKTAG('M', 'D', 'P', 'R'):
		527	st = avformat_new_stream(s, NULL);
		528	if (!st)
		529	return AVERROR(ENOMEM);
		530	st->id = avio_rb16(pb);
		531	avio_rb32(pb); /* max bit rate */
		532	st->codec->bit_rate = avio_rb32(pb); /* bit rate */
		533	avio_rb32(pb); /* max packet size */
		534	avio_rb32(pb); /* avg packet size */
		535	start_time = avio_rb32(pb); /* start time */
		536	avio_rb32(pb); /* preroll */
		537	duration = avio_rb32(pb); /* duration */
		538	st->start_time = start_time;
		539	st->duration = duration;
		540	if(duration>0)
		541	s->duration = AV_NOPTS_VALUE;
		542	get_str8(pb, buf, sizeof(buf)); /* desc */
		543	get_str8(pb, mime, sizeof(mime)); /* mimetype */
		544	st->codec->codec_type = AVMEDIA_TYPE_DATA;
		545	st->priv_data = ff_rm_alloc_rmstream();
		546	if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
		547	avio_rb32(pb), mime) < 0)
		548	return -1;
		549	break;
		550	case MKTAG('D', 'A', 'T', 'A'):
		551	goto header_end;
		552	default:
		553	/* unknown tag: skip it */
		554	avio_skip(pb, tag_size - 10);
		555	break;
		556	}
		557	}
		558	header_end:
		559	rm->nb_packets = avio_rb32(pb); /* number of packets */
		560	if (!rm->nb_packets && (flags & 4))
		561	rm->nb_packets = 3600 * 25;
		562	avio_rb32(pb); /* next data header */
		563
		564	if (!data_off)
		565	data_off = avio_tell(pb) - 18;
		566	if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
		567	avio_seek(pb, indx_off, SEEK_SET) >= 0) {
		568	rm_read_index(s);
		569	avio_seek(pb, data_off + 18, SEEK_SET);
		570	}
		571
		572	return 0;
		573	}
		574
		575	static int get_num(AVIOContext pb, int len)
		576	{
		577	int n, n1;
		578
		579	n = avio_rb16(pb);
		580	(*len)-=2;
		581	n &= 0x7FFF;
		582	if (n >= 0x4000) {
		583	return n - 0x4000;
		584	} else {
		585	n1 = avio_rb16(pb);
		586	(*len)-=2;
		587	return (n << 16) \| n1;
		588	}
		589	}
		590
		591	/* multiple of 20 bytes for ra144 (ugly) */
		592	#define RAW_PACKET_SIZE 1000
		593
		594	static int sync(AVFormatContext s, int64_t timestamp, int flags, int stream_index, int64_t *pos){
		595	RMDemuxContext *rm = s->priv_data;
		596	AVIOContext *pb = s->pb;
		597	AVStream *st;
		598	uint32_t state=0xFFFFFFFF;
		599
		600	while(!url_feof(pb)){
		601	int len, num, i;
		602	*pos= avio_tell(pb) - 3;
		603	if(rm->remaining_len > 0){
		604	num= rm->current_stream;
		605	len= rm->remaining_len;
		606	*timestamp = AV_NOPTS_VALUE;
		607	*flags= 0;
		608	}else{
		609	state= (state<<8) + avio_r8(pb);
		610
		611	if(state == MKBETAG('I', 'N', 'D', 'X')){
		612	int n_pkts, expected_len;
		613	len = avio_rb32(pb);
		614	avio_skip(pb, 2);
		615	n_pkts = avio_rb32(pb);
		616	expected_len = 20 + n_pkts * 14;
		617	if (len == 20)
		618	/* some files don't add index entries to chunk size... */
		619	len = expected_len;
		620	else if (len != expected_len)
		621	av_log(s, AV_LOG_WARNING,
		622	"Index size %d (%d pkts) is wrong, should be %d.\n",
		623	len, n_pkts, expected_len);
		624	len -= 14; // we already read part of the index header
		625	if(len<0)
		626	continue;
		627	goto skip;
		628	} else if (state == MKBETAG('D','A','T','A')) {
		629	av_log(s, AV_LOG_WARNING,
		630	"DATA tag in middle of chunk, file may be broken.\n");
		631	}
		632
		633	if(state > (unsigned)0xFFFF \|\| state <= 12)
		634	continue;
		635	len=state - 12;
		636	state= 0xFFFFFFFF;
		637
		638	num = avio_rb16(pb);
		639	*timestamp = avio_rb32(pb);
		640	avio_r8(pb); /* reserved */
		641	flags = avio_r8(pb); / flags */
		642	}
		643	for(i=0;inb_streams;i++) {
		644	st = s->streams[i];
		645	if (num == st->id)
		646	break;
		647	}
		648	if (i == s->nb_streams) {
		649	skip:
		650	/* skip packet if unknown number */
		651	avio_skip(pb, len);
		652	rm->remaining_len = 0;
		653	continue;
		654	}
		655	*stream_index= i;
		656
		657	return len;
		658	}
		659	return -1;
		660	}
		661
		662	static int rm_assemble_video_frame(AVFormatContext s, AVIOContext pb,
		663	RMDemuxContext rm, RMStream vst,
		664	AVPacket pkt, int len, int pseq,
		665	int64_t *timestamp)
		666	{
		667	int hdr;
		668	int seq = 0, pic_num = 0, len2 = 0, pos = 0; //init to silcense compiler warning
		669	int type;
		670	int ret;
		671
		672	hdr = avio_r8(pb); len--;
		673	type = hdr >> 6;
		674
		675	if(type != 3){ // not frame as a part of packet
		676	seq = avio_r8(pb); len--;
		677	}
		678	if(type != 1){ // not whole frame
		679	len2 = get_num(pb, &len);
		680	pos = get_num(pb, &len);
		681	pic_num = avio_r8(pb); len--;
		682	}
		683	if(len<0) {
		684	av_log(s, AV_LOG_ERROR, "Insufficient data\n");
		685	return -1;
		686	}
		687	rm->remaining_len = len;
		688	if(type&1){ // frame, not slice
		689	if(type == 3){ // frame as a part of packet
		690	len= len2;
		691	*timestamp = pos;
		692	}
		693	if(rm->remaining_len < len) {
		694	av_log(s, AV_LOG_ERROR, "Insufficient remaining len\n");
		695	return -1;
		696	}
		697	rm->remaining_len -= len;
		698	if(av_new_packet(pkt, len + 9) < 0)
		699	return AVERROR(EIO);
		700	pkt->data[0] = 0;
		701	AV_WL32(pkt->data + 1, 1);
		702	AV_WL32(pkt->data + 5, 0);
		703	if ((ret = avio_read(pb, pkt->data + 9, len)) != len) {
		704	av_free_packet(pkt);
		705	av_log(s, AV_LOG_ERROR, "Failed to read %d bytes\n", len);
		706	return ret < 0 ? ret : AVERROR(EIO);
		707	}
		708	return 0;
		709	}
		710	//now we have to deal with single slice
		711
		712	*pseq = seq;
		713	if((seq & 0x7F) == 1 \|\| vst->curpic_num != pic_num){
		714	if (len2 > ffio_limit(pb, len2)) {
		715	av_log(s, AV_LOG_ERROR, "Impossibly sized packet\n");
		716	return AVERROR_INVALIDDATA;
		717	}
		718	vst->slices = ((hdr & 0x3F) << 1) + 1;
		719	vst->videobufsize = len2 + 8*vst->slices + 1;
		720	av_free_packet(&vst->pkt); //FIXME this should be output.
		721	if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
		722	return AVERROR(ENOMEM);
		723	memset(vst->pkt.data, 0, vst->pkt.size);
		724	vst->videobufpos = 8*vst->slices + 1;
		725	vst->cur_slice = 0;
		726	vst->curpic_num = pic_num;
		727	vst->pktpos = avio_tell(pb);
		728	}
		729	if(type == 2)
		730	len = FFMIN(len, pos);
		731
		732	if(++vst->cur_slice > vst->slices) {
		733	av_log(s, AV_LOG_ERROR, "cur slice %d, too large\n", vst->cur_slice);
		734	return 1;
		735	}
		736	if(!vst->pkt.data)
		737	return AVERROR(ENOMEM);
		738	AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
		739	AV_WL32(vst->pkt.data - 3 + 8vst->cur_slice, vst->videobufpos - 8vst->slices - 1);
		740	if(vst->videobufpos + len > vst->videobufsize) {
		741	av_log(s, AV_LOG_ERROR, "outside videobufsize\n");
		742	return 1;
		743	}
		744	if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
		745	return AVERROR(EIO);
		746	vst->videobufpos += len;
		747	rm->remaining_len-= len;
		748
		749	if (type == 2 \|\| vst->videobufpos == vst->videobufsize) {
		750	vst->pkt.data[0] = vst->cur_slice-1;
		751	*pkt= vst->pkt;
		752	vst->pkt.data= NULL;
		753	vst->pkt.size= 0;
		754	vst->pkt.buf = NULL;
		755	#if FF_API_DESTRUCT_PACKET
		756	FF_DISABLE_DEPRECATION_WARNINGS
		757	vst->pkt.destruct = NULL;
		758	FF_ENABLE_DEPRECATION_WARNINGS
		759	#endif
		760	if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
		761	memmove(pkt->data + 1 + 8vst->cur_slice, pkt->data + 1 + 8vst->slices,
		762	vst->videobufpos - 1 - 8*vst->slices);
		763	pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
		764	pkt->pts = AV_NOPTS_VALUE;
		765	pkt->pos = vst->pktpos;
		766	vst->slices = 0;
		767	return 0;
		768	}
		769
		770	return 1;
		771	}
		772
		773	static inline void
		774	rm_ac3_swap_bytes (AVStream st, AVPacket pkt)
		775	{
		776	uint8_t *ptr;
		777	int j;
		778
		779	if (st->codec->codec_id == AV_CODEC_ID_AC3) {
		780	ptr = pkt->data;
		781	for (j=0;jsize;j+=2) {
		782	FFSWAP(int, ptr[0], ptr[1]);
		783	ptr += 2;
		784	}
		785	}
		786	}
		787
		788	int
		789	ff_rm_parse_packet (AVFormatContext s, AVIOContext pb,
		790	AVStream st, RMStream ast, int len, AVPacket *pkt,
		791	int *seq, int flags, int64_t timestamp)
		792	{
		793	RMDemuxContext *rm = s->priv_data;
		794	int ret;
		795
		796	if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
		797	rm->current_stream= st->id;
		798	ret = rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, ×tamp);
		799	if(ret)
		800	return ret < 0 ? ret : -1; //got partial frame or error
		801	} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
		802	if ((ast->deint_id == DEINT_ID_GENR) \|\|
		803	(ast->deint_id == DEINT_ID_INT4) \|\|
		804	(ast->deint_id == DEINT_ID_SIPR)) {
		805	int x;
		806	int sps = ast->sub_packet_size;
		807	int cfs = ast->coded_framesize;
		808	int h = ast->sub_packet_h;
		809	int y = ast->sub_packet_cnt;
		810	int w = ast->audio_framesize;
		811
		812	if (flags & 2)
		813	y = ast->sub_packet_cnt = 0;
		814	if (!y)
		815	ast->audiotimestamp = timestamp;
		816
		817	switch (ast->deint_id) {
		818	case DEINT_ID_INT4:
		819	for (x = 0; x < h/2; x++)
		820	avio_read(pb, ast->pkt.data+x2w+y*cfs, cfs);
		821	break;
		822	case DEINT_ID_GENR:
		823	for (x = 0; x < w/sps; x++)
		824	avio_read(pb, ast->pkt.data+sps(hx+((h+1)/2)*(y&1)+(y>>1)), sps);
		825	break;
		826	case DEINT_ID_SIPR:
		827	avio_read(pb, ast->pkt.data + y * w, w);
		828	break;
		829	}
		830
		831	if (++(ast->sub_packet_cnt) < h)
		832	return -1;
		833	if (ast->deint_id == DEINT_ID_SIPR)
		834	ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
		835
		836	ast->sub_packet_cnt = 0;
		837	rm->audio_stream_num = st->index;
		838	rm->audio_pkt_cnt = h * w / st->codec->block_align;
		839	} else if ((ast->deint_id == DEINT_ID_VBRF) \|\|
		840	(ast->deint_id == DEINT_ID_VBRS)) {
		841	int x;
		842	rm->audio_stream_num = st->index;
		843	ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
		844	if (ast->sub_packet_cnt) {
		845	for (x = 0; x < ast->sub_packet_cnt; x++)
		846	ast->sub_packet_lengths[x] = avio_rb16(pb);
		847	rm->audio_pkt_cnt = ast->sub_packet_cnt;
		848	ast->audiotimestamp = timestamp;
		849	} else
		850	return -1;
		851	} else {
		852	av_get_packet(pb, pkt, len);
		853	rm_ac3_swap_bytes(st, pkt);
		854	}
		855	} else
		856	av_get_packet(pb, pkt, len);
		857
		858	pkt->stream_index = st->index;
		859
		860	#if 0
		861	if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
		862	if(st->codec->codec_id == AV_CODEC_ID_RV20){
		863	int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
		864	av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", timestamp, timestamp*512LL/25, seq);
		865
		866	seq \|= (timestamp&~0x3FFF);
		867	if(seq - timestamp > 0x2000) seq -= 0x4000;
		868	if(seq - timestamp < -0x2000) seq += 0x4000;
		869	}
		870	}
		871	#endif
		872
		873	pkt->pts = timestamp;
		874	if (flags & 2)
		875	pkt->flags \|= AV_PKT_FLAG_KEY;
		876
		877	return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
		878	}
		879
		880	int
		881	ff_rm_retrieve_cache (AVFormatContext s, AVIOContext pb,
		882	AVStream st, RMStream ast, AVPacket *pkt)
		883	{
		884	RMDemuxContext *rm = s->priv_data;
		885
		886	av_assert0 (rm->audio_pkt_cnt > 0);
		887
		888	if (ast->deint_id == DEINT_ID_VBRF \|\|
		889	ast->deint_id == DEINT_ID_VBRS)
		890	av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
		891	else {
		892	if(av_new_packet(pkt, st->codec->block_align) < 0)
		893	return AVERROR(ENOMEM);
		894	memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
		895	(ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
		896	st->codec->block_align);
		897	}
		898	rm->audio_pkt_cnt--;
		899	if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
		900	ast->audiotimestamp = AV_NOPTS_VALUE;
		901	pkt->flags = AV_PKT_FLAG_KEY;
		902	} else
		903	pkt->flags = 0;
		904	pkt->stream_index = st->index;
		905
		906	return rm->audio_pkt_cnt;
		907	}
		908
		909	static int rm_read_packet(AVFormatContext s, AVPacket pkt)
		910	{
		911	RMDemuxContext *rm = s->priv_data;
		912	AVStream *st = NULL; // init to silence compiler warning
		913	int i, len, res, seq = 1;
		914	int64_t timestamp, pos;
		915	int flags;
		916
		917	for (;;) {
		918	if (rm->audio_pkt_cnt) {
		919	// If there are queued audio packet return them first
		920	st = s->streams[rm->audio_stream_num];
		921	res = ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
		922	if(res < 0)
		923	return res;
		924	flags = 0;
		925	} else {
		926	if (rm->old_format) {
		927	RMStream *ast;
		928
		929	st = s->streams[0];
		930	ast = st->priv_data;
		931	timestamp = AV_NOPTS_VALUE;
		932	len = !ast->audio_framesize ? RAW_PACKET_SIZE :
		933	ast->coded_framesize * ast->sub_packet_h / 2;
		934	flags = (seq++ == 1) ? 2 : 0;
		935	pos = avio_tell(s->pb);
		936	} else {
		937	len=sync(s, ×tamp, &flags, &i, &pos);
		938	if (len > 0)
		939	st = s->streams[i];
		940	}
		941
		942	if(len<0 \|\| url_feof(s->pb))
		943	return AVERROR(EIO);
		944
		945	res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
		946	&seq, flags, timestamp);
		947	if (res < -1)
		948	return res;
		949	if((flags&2) && (seq&0x7F) == 1)
		950	av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
		951	if (res)
		952	continue;
		953	}
		954
		955	if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
		956	\|\| st->discard >= AVDISCARD_ALL){
		957	av_free_packet(pkt);
		958	} else
		959	break;
		960	}
		961
		962	return 0;
		963	}
		964
		965	static int rm_read_close(AVFormatContext *s)
		966	{
		967	int i;
		968
		969	for (i=0;inb_streams;i++)
		970	ff_rm_free_rmstream(s->streams[i]->priv_data);
		971
		972	return 0;
		973	}
		974
		975	static int rm_probe(AVProbeData *p)
		976	{
		977	/* check file header */
		978	if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
		979	p->buf[2] == 'M' && p->buf[3] == 'F' &&
		980	p->buf[4] == 0 && p->buf[5] == 0) \|\|
		981	(p->buf[0] == '.' && p->buf[1] == 'r' &&
		982	p->buf[2] == 'a' && p->buf[3] == 0xfd))
		983	return AVPROBE_SCORE_MAX;
		984	else
		985	return 0;
		986	}
		987
		988	static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
		989	int64_t *ppos, int64_t pos_limit)
		990	{
		991	RMDemuxContext *rm = s->priv_data;
		992	int64_t pos, dts;
		993	int stream_index2, flags, len, h;
		994
		995	pos = *ppos;
		996
		997	if(rm->old_format)
		998	return AV_NOPTS_VALUE;
		999
		1000	if (avio_seek(s->pb, pos, SEEK_SET) < 0)
		1001	return AV_NOPTS_VALUE;
		1002
		1003	rm->remaining_len=0;
		1004	for(;;){
		1005	int seq=1;
		1006	AVStream *st;
		1007
		1008	len=sync(s, &dts, &flags, &stream_index2, &pos);
		1009	if(len<0)
		1010	return AV_NOPTS_VALUE;
		1011
		1012	st = s->streams[stream_index2];
		1013	if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
		1014	h= avio_r8(s->pb); len--;
		1015	if(!(h & 0x40)){
		1016	seq = avio_r8(s->pb); len--;
		1017	}
		1018	}
		1019
		1020	if((flags&2) && (seq&0x7F) == 1){
		1021	av_dlog(s, "%d %d-%d %"PRId64" %d\n",
		1022	flags, stream_index2, stream_index, dts, seq);
		1023	av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
		1024	if(stream_index2 == stream_index)
		1025	break;
		1026	}
		1027
		1028	avio_skip(s->pb, len);
		1029	}
		1030	*ppos = pos;
		1031	return dts;
		1032	}
		1033
		1034	static int rm_read_seek(AVFormatContext *s, int stream_index,
		1035	int64_t pts, int flags)
		1036	{
		1037	RMDemuxContext *rm = s->priv_data;
		1038
		1039	if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
		1040	return -1;
		1041	rm->audio_pkt_cnt = 0;
		1042	return 0;
		1043	}
		1044
		1045
		1046	AVInputFormat ff_rm_demuxer = {
		1047	.name = "rm",
		1048	.long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
		1049	.priv_data_size = sizeof(RMDemuxContext),
		1050	.read_probe = rm_probe,
		1051	.read_header = rm_read_header,
		1052	.read_packet = rm_read_packet,
		1053	.read_close = rm_read_close,
		1054	.read_timestamp = rm_read_dts,
		1055	.read_seek = rm_read_seek,
		1056	};
		1057
		1058	AVInputFormat ff_rdt_demuxer = {
		1059	.name = "rdt",
		1060	.long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),
		1061	.priv_data_size = sizeof(RMDemuxContext),
		1062	.read_close = rm_read_close,
		1063	.flags = AVFMT_NOFILE,
		1064	};

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(root)/contrib/sdk/sources/ffmpeg/libavformat/rmdec.c – Rev 4349