2 * Interplay MVE File Demuxer
3 * Copyright (c) 2003 The FFmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
24 * Interplay MVE file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * For more information regarding the Interplay MVE file format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 * The aforementioned site also contains a command line utility for parsing
29 * IP MVE files so that you can get a good idea of the typical structure of
30 * such files. This demuxer is not the best example to use if you are trying
31 * to write your own as it uses a rather roundabout approach for splitting
32 * up and sending out the chunks.
35 #include "libavutil/channel_layout.h"
36 #include "libavutil/intreadwrite.h"
40 #define CHUNK_PREAMBLE_SIZE 4
41 #define OPCODE_PREAMBLE_SIZE 4
43 #define CHUNK_INIT_AUDIO 0x0000
44 #define CHUNK_AUDIO_ONLY 0x0001
45 #define CHUNK_INIT_VIDEO 0x0002
46 #define CHUNK_VIDEO 0x0003
47 #define CHUNK_SHUTDOWN 0x0004
48 #define CHUNK_END 0x0005
49 /* these last types are used internally */
50 #define CHUNK_DONE 0xFFFC
51 #define CHUNK_NOMEM 0xFFFD
52 #define CHUNK_EOF 0xFFFE
53 #define CHUNK_BAD 0xFFFF
55 #define OPCODE_END_OF_STREAM 0x00
56 #define OPCODE_END_OF_CHUNK 0x01
57 #define OPCODE_CREATE_TIMER 0x02
58 #define OPCODE_INIT_AUDIO_BUFFERS 0x03
59 #define OPCODE_START_STOP_AUDIO 0x04
60 #define OPCODE_INIT_VIDEO_BUFFERS 0x05
61 #define OPCODE_VIDEO_DATA_06 0x06
62 #define OPCODE_SEND_BUFFER 0x07
63 #define OPCODE_AUDIO_FRAME 0x08
64 #define OPCODE_SILENCE_FRAME 0x09
65 #define OPCODE_INIT_VIDEO_MODE 0x0A
66 #define OPCODE_CREATE_GRADIENT 0x0B
67 #define OPCODE_SET_PALETTE 0x0C
68 #define OPCODE_SET_PALETTE_COMPRESSED 0x0D
69 #define OPCODE_SET_SKIP_MAP 0x0E
70 #define OPCODE_SET_DECODING_MAP 0x0F
71 #define OPCODE_VIDEO_DATA_10 0x10
72 #define OPCODE_VIDEO_DATA_11 0x11
73 #define OPCODE_UNKNOWN_12 0x12
74 #define OPCODE_UNKNOWN_13 0x13
75 #define OPCODE_UNKNOWN_14 0x14
76 #define OPCODE_UNKNOWN_15 0x15
78 #define PALETTE_COUNT 256
80 typedef struct IPMVEContext {
85 uint64_t frame_pts_inc;
87 unsigned int video_bpp;
88 unsigned int video_width;
89 unsigned int video_height;
91 uint32_t palette[256];
97 unsigned int audio_bits;
98 unsigned int audio_channels;
99 unsigned int audio_sample_rate;
100 enum AVCodecID audio_type;
101 unsigned int audio_frame_count;
103 int video_stream_index;
104 int audio_stream_index;
106 int64_t audio_chunk_offset;
107 int audio_chunk_size;
108 int64_t video_chunk_offset;
109 int video_chunk_size;
110 int64_t skip_map_chunk_offset;
111 int skip_map_chunk_size;
112 int64_t decode_map_chunk_offset;
113 int decode_map_chunk_size;
115 int64_t next_chunk_offset;
119 static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb,
124 if (s->audio_chunk_offset && s->audio_channels && s->audio_bits) {
125 if (s->audio_type == AV_CODEC_ID_NONE) {
126 av_log(s->avf, AV_LOG_ERROR, "Can not read audio packet before"
127 "audio codec is known\n");
131 /* adjust for PCM audio by skipping chunk header */
132 if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) {
133 s->audio_chunk_offset += 6;
134 s->audio_chunk_size -= 6;
137 avio_seek(pb, s->audio_chunk_offset, SEEK_SET);
138 s->audio_chunk_offset = 0;
140 if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size))
143 pkt->stream_index = s->audio_stream_index;
144 pkt->pts = s->audio_frame_count;
146 /* audio frame maintenance */
147 if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM)
148 s->audio_frame_count +=
149 (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
151 s->audio_frame_count +=
152 (s->audio_chunk_size - 6 - s->audio_channels) / s->audio_channels;
154 av_log(s->avf, AV_LOG_TRACE, "sending audio frame with pts %"PRId64" (%d audio frames)\n",
155 pkt->pts, s->audio_frame_count);
157 chunk_type = CHUNK_VIDEO;
159 } else if (s->frame_format) {
161 /* send the frame format, decode map, the video data, skip map, and the send_buffer flag together */
163 if (av_new_packet(pkt, 8 + s->decode_map_chunk_size + s->video_chunk_size + s->skip_map_chunk_size))
166 if (s->has_palette) {
169 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
172 memcpy(pal, s->palette, AVPALETTE_SIZE);
178 ff_add_param_change(pkt, 0, 0, 0, s->video_width, s->video_height);
182 AV_WL8(pkt->data, s->frame_format);
183 AV_WL8(pkt->data + 1, s->send_buffer);
184 AV_WL16(pkt->data + 2, s->video_chunk_size);
185 AV_WL16(pkt->data + 4, s->decode_map_chunk_size);
186 AV_WL16(pkt->data + 6, s->skip_map_chunk_size);
191 pkt->pos = s->video_chunk_offset;
192 avio_seek(pb, s->video_chunk_offset, SEEK_SET);
193 s->video_chunk_offset = 0;
195 if (avio_read(pb, pkt->data + 8, s->video_chunk_size) !=
196 s->video_chunk_size) {
200 if (s->decode_map_chunk_size) {
201 pkt->pos = s->decode_map_chunk_offset;
202 avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET);
203 s->decode_map_chunk_offset = 0;
205 if (avio_read(pb, pkt->data + 8 + s->video_chunk_size,
206 s->decode_map_chunk_size) != s->decode_map_chunk_size) {
211 if (s->skip_map_chunk_size) {
212 pkt->pos = s->skip_map_chunk_offset;
213 avio_seek(pb, s->skip_map_chunk_offset, SEEK_SET);
214 s->skip_map_chunk_offset = 0;
216 if (avio_read(pb, pkt->data + 8 + s->video_chunk_size + s->decode_map_chunk_size,
217 s->skip_map_chunk_size) != s->skip_map_chunk_size) {
222 s->video_chunk_size = 0;
223 s->decode_map_chunk_size = 0;
224 s->skip_map_chunk_size = 0;
226 pkt->stream_index = s->video_stream_index;
227 pkt->pts = s->video_pts;
229 av_log(s->avf, AV_LOG_TRACE, "sending video frame with pts %"PRId64"\n", pkt->pts);
231 s->video_pts += s->frame_pts_inc;
233 chunk_type = CHUNK_VIDEO;
237 avio_seek(pb, s->next_chunk_offset, SEEK_SET);
238 chunk_type = CHUNK_DONE;
245 static int init_audio(AVFormatContext *s)
247 IPMVEContext *ipmovie = s->priv_data;
248 AVStream *st = avformat_new_stream(s, NULL);
250 return AVERROR(ENOMEM);
251 avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate);
252 ipmovie->audio_stream_index = st->index;
253 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
254 st->codecpar->codec_id = ipmovie->audio_type;
255 st->codecpar->codec_tag = 0; /* no tag */
256 st->codecpar->channels = ipmovie->audio_channels;
257 st->codecpar->channel_layout = st->codecpar->channels == 1 ? AV_CH_LAYOUT_MONO :
259 st->codecpar->sample_rate = ipmovie->audio_sample_rate;
260 st->codecpar->bits_per_coded_sample = ipmovie->audio_bits;
261 st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
262 st->codecpar->bits_per_coded_sample;
263 if (st->codecpar->codec_id == AV_CODEC_ID_INTERPLAY_DPCM)
264 st->codecpar->bit_rate /= 2;
265 st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample;
270 /* This function loads and processes a single chunk in an IP movie file.
271 * It returns the type of chunk that was processed. */
272 static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb,
275 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
278 unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
279 unsigned char opcode_type;
280 unsigned char opcode_version;
282 unsigned char scratch[1024];
284 int first_color, last_color;
286 unsigned char r, g, b;
287 unsigned int width, height;
289 /* see if there are any pending packets */
290 chunk_type = load_ipmovie_packet(s, pb, pkt);
291 if (chunk_type != CHUNK_DONE)
294 /* read the next chunk, wherever the file happens to be pointing */
297 if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
300 chunk_size = AV_RL16(&chunk_preamble[0]);
301 chunk_type = AV_RL16(&chunk_preamble[2]);
303 av_log(s->avf, AV_LOG_TRACE, "chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
305 switch (chunk_type) {
307 case CHUNK_INIT_AUDIO:
308 av_log(s->avf, AV_LOG_TRACE, "initialize audio\n");
311 case CHUNK_AUDIO_ONLY:
312 av_log(s->avf, AV_LOG_TRACE, "audio only\n");
315 case CHUNK_INIT_VIDEO:
316 av_log(s->avf, AV_LOG_TRACE, "initialize video\n");
320 av_log(s->avf, AV_LOG_TRACE, "video (and audio)\n");
324 av_log(s->avf, AV_LOG_TRACE, "shutdown\n");
328 av_log(s->avf, AV_LOG_TRACE, "end\n");
332 av_log(s->avf, AV_LOG_TRACE, "invalid chunk\n");
333 chunk_type = CHUNK_BAD;
338 while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
340 /* read the next chunk, wherever the file happens to be pointing */
342 chunk_type = CHUNK_EOF;
345 if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
346 CHUNK_PREAMBLE_SIZE) {
347 chunk_type = CHUNK_BAD;
351 opcode_size = AV_RL16(&opcode_preamble[0]);
352 opcode_type = opcode_preamble[2];
353 opcode_version = opcode_preamble[3];
355 chunk_size -= OPCODE_PREAMBLE_SIZE;
356 chunk_size -= opcode_size;
357 if (chunk_size < 0) {
358 av_log(s->avf, AV_LOG_TRACE, "chunk_size countdown just went negative\n");
359 chunk_type = CHUNK_BAD;
363 av_log(s->avf, AV_LOG_TRACE, " opcode type %02X, version %d, 0x%04X bytes: ",
364 opcode_type, opcode_version, opcode_size);
365 switch (opcode_type) {
367 case OPCODE_END_OF_STREAM:
368 av_log(s->avf, AV_LOG_TRACE, "end of stream\n");
369 avio_skip(pb, opcode_size);
372 case OPCODE_END_OF_CHUNK:
373 av_log(s->avf, AV_LOG_TRACE, "end of chunk\n");
374 avio_skip(pb, opcode_size);
377 case OPCODE_CREATE_TIMER:
378 av_log(s->avf, AV_LOG_TRACE, "create timer\n");
379 if ((opcode_version > 0) || (opcode_size != 6)) {
380 av_log(s->avf, AV_LOG_TRACE, "bad create_timer opcode\n");
381 chunk_type = CHUNK_BAD;
384 if (avio_read(pb, scratch, opcode_size) !=
386 chunk_type = CHUNK_BAD;
389 s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]);
392 case OPCODE_INIT_AUDIO_BUFFERS:
393 av_log(s->avf, AV_LOG_TRACE, "initialize audio buffers\n");
394 if (opcode_version > 1 || opcode_size > 10 || opcode_size < 6) {
395 av_log(s->avf, AV_LOG_TRACE, "bad init_audio_buffers opcode\n");
396 chunk_type = CHUNK_BAD;
399 if (avio_read(pb, scratch, opcode_size) !=
401 chunk_type = CHUNK_BAD;
404 s->audio_sample_rate = AV_RL16(&scratch[4]);
405 audio_flags = AV_RL16(&scratch[2]);
406 /* bit 0 of the flags: 0 = mono, 1 = stereo */
407 s->audio_channels = (audio_flags & 1) + 1;
408 /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
409 s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
410 /* bit 2 indicates compressed audio in version 1 opcode */
411 if ((opcode_version == 1) && (audio_flags & 0x4))
412 s->audio_type = AV_CODEC_ID_INTERPLAY_DPCM;
413 else if (s->audio_bits == 16)
414 s->audio_type = AV_CODEC_ID_PCM_S16LE;
416 s->audio_type = AV_CODEC_ID_PCM_U8;
417 av_log(s->avf, AV_LOG_TRACE, "audio: %d bits, %d Hz, %s, %s format\n",
418 s->audio_bits, s->audio_sample_rate,
419 (s->audio_channels == 2) ? "stereo" : "mono",
420 (s->audio_type == AV_CODEC_ID_INTERPLAY_DPCM) ?
421 "Interplay audio" : "PCM");
424 case OPCODE_START_STOP_AUDIO:
425 av_log(s->avf, AV_LOG_TRACE, "start/stop audio\n");
426 avio_skip(pb, opcode_size);
429 case OPCODE_INIT_VIDEO_BUFFERS:
430 av_log(s->avf, AV_LOG_TRACE, "initialize video buffers\n");
431 if ((opcode_version > 2) || (opcode_size > 8) || opcode_size < 4
432 || opcode_version == 2 && opcode_size < 8
434 av_log(s->avf, AV_LOG_TRACE, "bad init_video_buffers opcode\n");
435 chunk_type = CHUNK_BAD;
438 if (avio_read(pb, scratch, opcode_size) !=
440 chunk_type = CHUNK_BAD;
443 width = AV_RL16(&scratch[0]) * 8;
444 height = AV_RL16(&scratch[2]) * 8;
445 if (width != s->video_width) {
446 s->video_width = width;
449 if (height != s->video_height) {
450 s->video_height = height;
453 if (opcode_version < 2 || !AV_RL16(&scratch[6])) {
458 av_log(s->avf, AV_LOG_TRACE, "video resolution: %d x %d\n",
459 s->video_width, s->video_height);
462 case OPCODE_UNKNOWN_12:
463 case OPCODE_UNKNOWN_13:
464 case OPCODE_UNKNOWN_14:
465 case OPCODE_UNKNOWN_15:
466 av_log(s->avf, AV_LOG_TRACE, "unknown (but documented) opcode %02X\n", opcode_type);
467 avio_skip(pb, opcode_size);
470 case OPCODE_SEND_BUFFER:
471 av_log(s->avf, AV_LOG_TRACE, "send buffer\n");
472 avio_skip(pb, opcode_size);
476 case OPCODE_AUDIO_FRAME:
477 av_log(s->avf, AV_LOG_TRACE, "audio frame\n");
479 /* log position and move on for now */
480 s->audio_chunk_offset = avio_tell(pb);
481 s->audio_chunk_size = opcode_size;
482 avio_skip(pb, opcode_size);
485 case OPCODE_SILENCE_FRAME:
486 av_log(s->avf, AV_LOG_TRACE, "silence frame\n");
487 avio_skip(pb, opcode_size);
490 case OPCODE_INIT_VIDEO_MODE:
491 av_log(s->avf, AV_LOG_TRACE, "initialize video mode\n");
492 avio_skip(pb, opcode_size);
495 case OPCODE_CREATE_GRADIENT:
496 av_log(s->avf, AV_LOG_TRACE, "create gradient\n");
497 avio_skip(pb, opcode_size);
500 case OPCODE_SET_PALETTE:
501 av_log(s->avf, AV_LOG_TRACE, "set palette\n");
502 /* check for the logical maximum palette size
503 * (3 * 256 + 4 bytes) */
504 if (opcode_size > 0x304 || opcode_size < 4) {
505 av_log(s->avf, AV_LOG_TRACE, "demux_ipmovie: set_palette opcode with invalid size\n");
506 chunk_type = CHUNK_BAD;
509 if (avio_read(pb, scratch, opcode_size) != opcode_size) {
510 chunk_type = CHUNK_BAD;
514 /* load the palette into internal data structure */
515 first_color = AV_RL16(&scratch[0]);
516 last_color = first_color + AV_RL16(&scratch[2]) - 1;
517 /* sanity check (since they are 16 bit values) */
518 if ( (first_color > 0xFF) || (last_color > 0xFF)
519 || (last_color - first_color + 1)*3 + 4 > opcode_size) {
520 av_log(s->avf, AV_LOG_TRACE, "demux_ipmovie: set_palette indexes out of range (%d -> %d)\n",
521 first_color, last_color);
522 chunk_type = CHUNK_BAD;
525 j = 4; /* offset of first palette data */
526 for (i = first_color; i <= last_color; i++) {
527 /* the palette is stored as a 6-bit VGA palette, thus each
528 * component is shifted up to a 8-bit range */
529 r = scratch[j++] * 4;
530 g = scratch[j++] * 4;
531 b = scratch[j++] * 4;
532 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b);
533 s->palette[i] |= s->palette[i] >> 6 & 0x30303;
538 case OPCODE_SET_PALETTE_COMPRESSED:
539 av_log(s->avf, AV_LOG_TRACE, "set palette compressed\n");
540 avio_skip(pb, opcode_size);
543 case OPCODE_SET_SKIP_MAP:
544 av_log(s->avf, AV_LOG_TRACE, "set skip map\n");
546 /* log position and move on for now */
547 s->skip_map_chunk_offset = avio_tell(pb);
548 s->skip_map_chunk_size = opcode_size;
549 avio_skip(pb, opcode_size);
552 case OPCODE_SET_DECODING_MAP:
553 av_log(s->avf, AV_LOG_TRACE, "set decoding map\n");
555 /* log position and move on for now */
556 s->decode_map_chunk_offset = avio_tell(pb);
557 s->decode_map_chunk_size = opcode_size;
558 avio_skip(pb, opcode_size);
561 case OPCODE_VIDEO_DATA_06:
562 av_log(s->avf, AV_LOG_TRACE, "set video data format 0x06\n");
563 s->frame_format = 0x06;
565 /* log position and move on for now */
566 s->video_chunk_offset = avio_tell(pb);
567 s->video_chunk_size = opcode_size;
568 avio_skip(pb, opcode_size);
571 case OPCODE_VIDEO_DATA_10:
572 av_log(s->avf, AV_LOG_TRACE, "set video data format 0x10\n");
573 s->frame_format = 0x10;
575 /* log position and move on for now */
576 s->video_chunk_offset = avio_tell(pb);
577 s->video_chunk_size = opcode_size;
578 avio_skip(pb, opcode_size);
581 case OPCODE_VIDEO_DATA_11:
582 av_log(s->avf, AV_LOG_TRACE, "set video data format 0x11\n");
583 s->frame_format = 0x11;
585 /* log position and move on for now */
586 s->video_chunk_offset = avio_tell(pb);
587 s->video_chunk_size = opcode_size;
588 avio_skip(pb, opcode_size);
592 av_log(s->avf, AV_LOG_TRACE, "*** unknown opcode type\n");
593 chunk_type = CHUNK_BAD;
599 if (s->avf->nb_streams == 1 && s->audio_type)
602 /* make a note of where the stream is sitting */
603 s->next_chunk_offset = avio_tell(pb);
605 /* dispatch the first of any pending packets */
606 if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY))
607 chunk_type = load_ipmovie_packet(s, pb, pkt);
612 static const char signature[] = "Interplay MVE File\x1A\0\x1A";
614 static int ipmovie_probe(const AVProbeData *p)
616 const uint8_t *b = p->buf;
617 const uint8_t *b_end = p->buf + p->buf_size - sizeof(signature);
619 if (b[0] == signature[0] && memcmp(b, signature, sizeof(signature)) == 0)
620 return AVPROBE_SCORE_MAX;
627 static int ipmovie_read_header(AVFormatContext *s)
629 IPMVEContext *ipmovie = s->priv_data;
630 AVIOContext *pb = s->pb;
633 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
635 uint8_t signature_buffer[sizeof(signature)];
639 avio_read(pb, signature_buffer, sizeof(signature_buffer));
640 while (memcmp(signature_buffer, signature, sizeof(signature))) {
641 memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);
642 signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb);
646 /* initialize private context members */
647 ipmovie->video_pts = ipmovie->audio_frame_count = 0;
648 ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
649 ipmovie->decode_map_chunk_offset = ipmovie->skip_map_chunk_offset = 0;
650 ipmovie->decode_map_chunk_size = ipmovie->video_chunk_size =
651 ipmovie->skip_map_chunk_size = 0;
652 ipmovie->send_buffer = ipmovie->frame_format = 0;
654 /* on the first read, this will position the stream at the first chunk */
655 ipmovie->next_chunk_offset = avio_tell(pb) + 4;
657 for (i = 0; i < 256; i++)
658 ipmovie->palette[i] = 0xFFU << 24;
660 /* process the first chunk which should be CHUNK_INIT_VIDEO */
661 if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO) {
662 av_packet_unref(&pkt);
663 return AVERROR_INVALIDDATA;
666 /* peek ahead to the next chunk-- if it is an init audio chunk, process
667 * it; if it is the first video chunk, this is a silent file */
668 if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
671 chunk_type = AV_RL16(&chunk_preamble[2]);
672 avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
674 if (chunk_type == CHUNK_VIDEO)
675 ipmovie->audio_type = AV_CODEC_ID_NONE; /* no audio */
676 else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) {
677 av_packet_unref(&pkt);
678 return AVERROR_INVALIDDATA;
681 /* initialize the stream decoders */
682 st = avformat_new_stream(s, NULL);
684 return AVERROR(ENOMEM);
685 avpriv_set_pts_info(st, 63, 1, 1000000);
686 ipmovie->video_stream_index = st->index;
687 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
688 st->codecpar->codec_id = AV_CODEC_ID_INTERPLAY_VIDEO;
689 st->codecpar->codec_tag = 0; /* no fourcc */
690 st->codecpar->width = ipmovie->video_width;
691 st->codecpar->height = ipmovie->video_height;
692 st->codecpar->bits_per_coded_sample = ipmovie->video_bpp;
694 if (ipmovie->audio_type) {
695 return init_audio(s);
697 s->ctx_flags |= AVFMTCTX_NOHEADER;
702 static int ipmovie_read_packet(AVFormatContext *s,
705 IPMVEContext *ipmovie = s->priv_data;
706 AVIOContext *pb = s->pb;
710 ret = process_ipmovie_chunk(ipmovie, pb, pkt);
711 if (ret == CHUNK_BAD)
712 ret = AVERROR_INVALIDDATA;
713 else if (ret == CHUNK_EOF)
715 else if (ret == CHUNK_NOMEM)
716 ret = AVERROR(ENOMEM);
717 else if (ret == CHUNK_END || ret == CHUNK_SHUTDOWN)
719 else if (ret == CHUNK_VIDEO)
721 else if (ret == CHUNK_INIT_VIDEO || ret == CHUNK_INIT_AUDIO)
730 AVInputFormat ff_ipmovie_demuxer = {
732 .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE"),
733 .priv_data_size = sizeof(IPMVEContext),
734 .read_probe = ipmovie_probe,
735 .read_header = ipmovie_read_header,
736 .read_packet = ipmovie_read_packet,