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/*
* Interplay MVE File Demuxer |
6dfa70f2 |
* Copyright (c) 2003 The FFmpeg Project |
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* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
/** |
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* @file |
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* Interplay MVE file demuxer
* by Mike Melanson (melanson@pcisys.net)
* For more information regarding the Interplay MVE file format, visit:
* http://www.pcisys.net/~melanson/codecs/
* The aforementioned site also contains a command line utility for parsing
* IP MVE files so that you can get a good idea of the typical structure of
* such files. This demuxer is not the best example to use if you are trying
* to write your own as it uses a rather roundabout approach for splitting
* up and sending out the chunks.
*/
|
41a2d959 |
#include "libavutil/channel_layout.h" |
6a5d31ac |
#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#define CHUNK_PREAMBLE_SIZE 4
#define OPCODE_PREAMBLE_SIZE 4
#define CHUNK_INIT_AUDIO 0x0000
#define CHUNK_AUDIO_ONLY 0x0001
#define CHUNK_INIT_VIDEO 0x0002
#define CHUNK_VIDEO 0x0003
#define CHUNK_SHUTDOWN 0x0004
#define CHUNK_END 0x0005
/* these last types are used internally */
#define CHUNK_DONE 0xFFFC
#define CHUNK_NOMEM 0xFFFD
#define CHUNK_EOF 0xFFFE
#define CHUNK_BAD 0xFFFF
#define OPCODE_END_OF_STREAM 0x00
#define OPCODE_END_OF_CHUNK 0x01
#define OPCODE_CREATE_TIMER 0x02
#define OPCODE_INIT_AUDIO_BUFFERS 0x03
#define OPCODE_START_STOP_AUDIO 0x04
#define OPCODE_INIT_VIDEO_BUFFERS 0x05
#define OPCODE_UNKNOWN_06 0x06
#define OPCODE_SEND_BUFFER 0x07
#define OPCODE_AUDIO_FRAME 0x08
#define OPCODE_SILENCE_FRAME 0x09
#define OPCODE_INIT_VIDEO_MODE 0x0A
#define OPCODE_CREATE_GRADIENT 0x0B
#define OPCODE_SET_PALETTE 0x0C
#define OPCODE_SET_PALETTE_COMPRESSED 0x0D
#define OPCODE_UNKNOWN_0E 0x0E
#define OPCODE_SET_DECODING_MAP 0x0F
#define OPCODE_UNKNOWN_10 0x10
#define OPCODE_VIDEO_DATA 0x11
#define OPCODE_UNKNOWN_12 0x12
#define OPCODE_UNKNOWN_13 0x13
#define OPCODE_UNKNOWN_14 0x14
#define OPCODE_UNKNOWN_15 0x15
#define PALETTE_COUNT 256
typedef struct IPMVEContext { |
8e0fdb03 |
AVFormatContext *avf; |
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unsigned char *buf;
int buf_size;
|
03c03afd |
uint64_t frame_pts_inc; |
3ef8be2b |
|
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unsigned int video_bpp; |
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unsigned int video_width;
unsigned int video_height;
int64_t video_pts; |
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uint32_t palette[256];
int has_palette; |
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int changed; |
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unsigned int audio_bits;
unsigned int audio_channels;
unsigned int audio_sample_rate; |
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enum AVCodecID audio_type; |
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unsigned int audio_frame_count;
int video_stream_index;
int audio_stream_index;
|
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int64_t audio_chunk_offset; |
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int audio_chunk_size; |
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int64_t video_chunk_offset; |
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int video_chunk_size; |
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int64_t decode_map_chunk_offset; |
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int decode_map_chunk_size;
|
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int64_t next_chunk_offset; |
3ef8be2b |
} IPMVEContext;
|
471fe57e |
static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb, |
3ef8be2b |
AVPacket *pkt) {
int chunk_type;
|
8d960fbc |
if (s->audio_chunk_offset && s->audio_channels && s->audio_bits) { |
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if (s->audio_type == AV_CODEC_ID_NONE) { |
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av_log(s->avf, AV_LOG_ERROR, "Can not read audio packet before" |
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"audio codec is known\n");
return CHUNK_BAD;
} |
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|
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/* adjust for PCM audio by skipping chunk header */ |
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if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) { |
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s->audio_chunk_offset += 6;
s->audio_chunk_size -= 6;
}
|
f59d8ff8 |
avio_seek(pb, s->audio_chunk_offset, SEEK_SET); |
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s->audio_chunk_offset = 0;
|
2692067a |
if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size))
return CHUNK_EOF; |
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pkt->stream_index = s->audio_stream_index; |
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pkt->pts = s->audio_frame_count; |
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/* audio frame maintenance */ |
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if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) |
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s->audio_frame_count +=
(s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
else
s->audio_frame_count += |
4556ebfb |
(s->audio_chunk_size - 6 - s->audio_channels) / s->audio_channels; |
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|
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av_log(s->avf, AV_LOG_TRACE, "sending audio frame with pts %"PRId64" (%d audio frames)\n", |
df96f22d |
pkt->pts, s->audio_frame_count); |
3ef8be2b |
chunk_type = CHUNK_VIDEO;
} else if (s->decode_map_chunk_offset) {
|
b76c707a |
/* send both the decode map and the video data together */ |
3ef8be2b |
|
c293ef25 |
if (av_new_packet(pkt, 2 + s->decode_map_chunk_size + s->video_chunk_size)) |
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return CHUNK_NOMEM;
|
2d8591c2 |
if (s->has_palette) {
uint8_t *pal;
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
AVPALETTE_SIZE);
if (pal) {
memcpy(pal, s->palette, AVPALETTE_SIZE);
s->has_palette = 0;
}
}
|
75146b88 |
if (s->changed) {
ff_add_param_change(pkt, 0, 0, 0, s->video_width, s->video_height);
s->changed = 0;
} |
2692067a |
pkt->pos= s->decode_map_chunk_offset; |
f59d8ff8 |
avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET); |
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s->decode_map_chunk_offset = 0;
|
c293ef25 |
AV_WL16(pkt->data, s->decode_map_chunk_size);
if (avio_read(pb, pkt->data + 2, s->decode_map_chunk_size) != |
3ef8be2b |
s->decode_map_chunk_size) { |
ce70f28a |
av_packet_unref(pkt); |
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return CHUNK_EOF;
}
|
f59d8ff8 |
avio_seek(pb, s->video_chunk_offset, SEEK_SET); |
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s->video_chunk_offset = 0;
|
c293ef25 |
if (avio_read(pb, pkt->data + 2 + s->decode_map_chunk_size, |
b76c707a |
s->video_chunk_size) != s->video_chunk_size) { |
ce70f28a |
av_packet_unref(pkt); |
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return CHUNK_EOF;
}
|
b76c707a |
pkt->stream_index = s->video_stream_index;
pkt->pts = s->video_pts;
|
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "sending video frame with pts %"PRId64"\n", pkt->pts); |
dda61423 |
|
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s->video_pts += s->frame_pts_inc;
chunk_type = CHUNK_VIDEO;
} else {
|
f59d8ff8 |
avio_seek(pb, s->next_chunk_offset, SEEK_SET); |
3ef8be2b |
chunk_type = CHUNK_DONE;
}
return chunk_type;
}
|
e0115383 |
static int init_audio(AVFormatContext *s)
{
IPMVEContext *ipmovie = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate);
ipmovie->audio_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = ipmovie->audio_type;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = ipmovie->audio_channels;
st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO :
AV_CH_LAYOUT_STEREO;
st->codec->sample_rate = ipmovie->audio_sample_rate;
st->codec->bits_per_coded_sample = ipmovie->audio_bits;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_coded_sample;
if (st->codec->codec_id == AV_CODEC_ID_INTERPLAY_DPCM)
st->codec->bit_rate /= 2;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
return 0;
}
|
3ef8be2b |
/* This function loads and processes a single chunk in an IP movie file.
* It returns the type of chunk that was processed. */ |
471fe57e |
static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb, |
3ef8be2b |
AVPacket *pkt)
{
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
int chunk_type;
int chunk_size;
unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
unsigned char opcode_type;
unsigned char opcode_version;
int opcode_size;
unsigned char scratch[1024]; |
b76c707a |
int i, j; |
3ef8be2b |
int first_color, last_color;
int audio_flags; |
2a2bbcb0 |
unsigned char r, g, b; |
75146b88 |
unsigned int width, height; |
3ef8be2b |
/* see if there are any pending packets */
chunk_type = load_ipmovie_packet(s, pb, pkt); |
49c8132b |
if (chunk_type != CHUNK_DONE) |
3ef8be2b |
return chunk_type;
/* read the next chunk, wherever the file happens to be pointing */ |
d34ec64a |
if (avio_feof(pb)) |
3ef8be2b |
return CHUNK_EOF; |
e63a3628 |
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
3ef8be2b |
CHUNK_PREAMBLE_SIZE)
return CHUNK_BAD; |
fead30d4 |
chunk_size = AV_RL16(&chunk_preamble[0]);
chunk_type = AV_RL16(&chunk_preamble[2]); |
3ef8be2b |
|
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size); |
3ef8be2b |
switch (chunk_type) {
case CHUNK_INIT_AUDIO: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "initialize audio\n"); |
3ef8be2b |
break;
case CHUNK_AUDIO_ONLY: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "audio only\n"); |
3ef8be2b |
break;
case CHUNK_INIT_VIDEO: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "initialize video\n"); |
3ef8be2b |
break;
case CHUNK_VIDEO: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "video (and audio)\n"); |
3ef8be2b |
break;
case CHUNK_SHUTDOWN: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "shutdown\n"); |
3ef8be2b |
break;
case CHUNK_END: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "end\n"); |
3ef8be2b |
break;
default: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "invalid chunk\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
}
while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
/* read the next chunk, wherever the file happens to be pointing */ |
d34ec64a |
if (avio_feof(pb)) { |
3ef8be2b |
chunk_type = CHUNK_EOF;
break;
} |
e63a3628 |
if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) != |
3ef8be2b |
CHUNK_PREAMBLE_SIZE) {
chunk_type = CHUNK_BAD;
break;
}
|
fead30d4 |
opcode_size = AV_RL16(&opcode_preamble[0]); |
3ef8be2b |
opcode_type = opcode_preamble[2];
opcode_version = opcode_preamble[3];
chunk_size -= OPCODE_PREAMBLE_SIZE;
chunk_size -= opcode_size;
if (chunk_size < 0) { |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "chunk_size countdown just went negative\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
}
|
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, " opcode type %02X, version %d, 0x%04X bytes: ", |
df96f22d |
opcode_type, opcode_version, opcode_size); |
3ef8be2b |
switch (opcode_type) {
case OPCODE_END_OF_STREAM: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "end of stream\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_END_OF_CHUNK: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "end of chunk\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_CREATE_TIMER: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "create timer\n"); |
892562e9 |
if ((opcode_version > 0) || (opcode_size != 6)) { |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "bad create_timer opcode\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
} |
e63a3628 |
if (avio_read(pb, scratch, opcode_size) != |
3ef8be2b |
opcode_size) {
chunk_type = CHUNK_BAD;
break;
} |
03c03afd |
s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]); |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, " %.2f frames/second (timer div = %d, subdiv = %d)\n", |
df96f22d |
1000000.0 / s->frame_pts_inc, AV_RL32(&scratch[0]),
AV_RL16(&scratch[4])); |
3ef8be2b |
break;
case OPCODE_INIT_AUDIO_BUFFERS: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "initialize audio buffers\n"); |
5f0d552c |
if (opcode_version > 1 || opcode_size > 10 || opcode_size < 6) { |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "bad init_audio_buffers opcode\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
} |
e63a3628 |
if (avio_read(pb, scratch, opcode_size) != |
3ef8be2b |
opcode_size) {
chunk_type = CHUNK_BAD;
break;
} |
fead30d4 |
s->audio_sample_rate = AV_RL16(&scratch[4]);
audio_flags = AV_RL16(&scratch[2]); |
3ef8be2b |
/* bit 0 of the flags: 0 = mono, 1 = stereo */
s->audio_channels = (audio_flags & 1) + 1;
/* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
/* bit 2 indicates compressed audio in version 1 opcode */
if ((opcode_version == 1) && (audio_flags & 0x4)) |
36ef5369 |
s->audio_type = AV_CODEC_ID_INTERPLAY_DPCM; |
3ef8be2b |
else if (s->audio_bits == 16) |
36ef5369 |
s->audio_type = AV_CODEC_ID_PCM_S16LE; |
3ef8be2b |
else |
36ef5369 |
s->audio_type = AV_CODEC_ID_PCM_U8; |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "audio: %d bits, %d Hz, %s, %s format\n", |
df96f22d |
s->audio_bits, s->audio_sample_rate,
(s->audio_channels == 2) ? "stereo" : "mono", |
36ef5369 |
(s->audio_type == AV_CODEC_ID_INTERPLAY_DPCM) ? |
df96f22d |
"Interplay audio" : "PCM"); |
3ef8be2b |
break;
case OPCODE_START_STOP_AUDIO: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "start/stop audio\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_INIT_VIDEO_BUFFERS: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "initialize video buffers\n"); |
7d7a7013 |
if ((opcode_version > 2) || (opcode_size > 8) || opcode_size < 4
|| opcode_version == 2 && opcode_size < 8
) { |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "bad init_video_buffers opcode\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
} |
e63a3628 |
if (avio_read(pb, scratch, opcode_size) != |
3ef8be2b |
opcode_size) {
chunk_type = CHUNK_BAD;
break;
} |
75146b88 |
width = AV_RL16(&scratch[0]) * 8;
height = AV_RL16(&scratch[2]) * 8;
if (width != s->video_width) {
s->video_width = width;
s->changed++;
}
if (height != s->video_height) {
s->video_height = height;
s->changed++;
} |
8badb23e |
if (opcode_version < 2 || !AV_RL16(&scratch[6])) {
s->video_bpp = 8;
} else {
s->video_bpp = 16;
} |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "video resolution: %d x %d\n", |
df96f22d |
s->video_width, s->video_height); |
3ef8be2b |
break;
case OPCODE_UNKNOWN_06:
case OPCODE_UNKNOWN_0E:
case OPCODE_UNKNOWN_10:
case OPCODE_UNKNOWN_12:
case OPCODE_UNKNOWN_13:
case OPCODE_UNKNOWN_14:
case OPCODE_UNKNOWN_15: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "unknown (but documented) opcode %02X\n", opcode_type); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_SEND_BUFFER: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "send buffer\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_AUDIO_FRAME: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "audio frame\n"); |
3ef8be2b |
/* log position and move on for now */ |
384c9c2f |
s->audio_chunk_offset = avio_tell(pb); |
3ef8be2b |
s->audio_chunk_size = opcode_size; |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_SILENCE_FRAME: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "silence frame\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_INIT_VIDEO_MODE: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "initialize video mode\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_CREATE_GRADIENT: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "create gradient\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_SET_PALETTE: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "set palette\n"); |
3ef8be2b |
/* check for the logical maximum palette size
* (3 * 256 + 4 bytes) */ |
947e40b9 |
if (opcode_size > 0x304 || opcode_size < 4) { |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "demux_ipmovie: set_palette opcode with invalid size\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
} |
e63a3628 |
if (avio_read(pb, scratch, opcode_size) != opcode_size) { |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
}
/* load the palette into internal data structure */ |
fead30d4 |
first_color = AV_RL16(&scratch[0]);
last_color = first_color + AV_RL16(&scratch[2]) - 1; |
3ef8be2b |
/* sanity check (since they are 16 bit values) */ |
4e575ade |
if ( (first_color > 0xFF) || (last_color > 0xFF)
|| (last_color - first_color + 1)*3 + 4 > opcode_size) { |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "demux_ipmovie: set_palette indexes out of range (%d -> %d)\n", |
3ef8be2b |
first_color, last_color);
chunk_type = CHUNK_BAD;
break;
}
j = 4; /* offset of first palette data */
for (i = first_color; i <= last_color; i++) { |
b76c707a |
/* the palette is stored as a 6-bit VGA palette, thus each
* component is shifted up to a 8-bit range */ |
2a2bbcb0 |
r = scratch[j++] * 4;
g = scratch[j++] * 4;
b = scratch[j++] * 4; |
ec0dc7e2 |
s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b);
s->palette[i] |= s->palette[i] >> 6 & 0x30303; |
3ef8be2b |
} |
2d8591c2 |
s->has_palette = 1; |
3ef8be2b |
break;
case OPCODE_SET_PALETTE_COMPRESSED: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "set palette compressed\n"); |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_SET_DECODING_MAP: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "set decoding map\n"); |
3ef8be2b |
/* log position and move on for now */ |
384c9c2f |
s->decode_map_chunk_offset = avio_tell(pb); |
3ef8be2b |
s->decode_map_chunk_size = opcode_size; |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
case OPCODE_VIDEO_DATA: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "set video data\n"); |
3ef8be2b |
/* log position and move on for now */ |
384c9c2f |
s->video_chunk_offset = avio_tell(pb); |
3ef8be2b |
s->video_chunk_size = opcode_size; |
45a8a02a |
avio_skip(pb, opcode_size); |
3ef8be2b |
break;
default: |
83d20a6a |
av_log(s->avf, AV_LOG_TRACE, "*** unknown opcode type\n"); |
3ef8be2b |
chunk_type = CHUNK_BAD;
break;
}
}
|
8e0fdb03 |
if (s->avf->nb_streams == 1 && s->audio_type)
init_audio(s->avf);
|
3ef8be2b |
/* make a note of where the stream is sitting */ |
384c9c2f |
s->next_chunk_offset = avio_tell(pb); |
3ef8be2b |
/* dispatch the first of any pending packets */
if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY))
chunk_type = load_ipmovie_packet(s, pb, pkt);
return chunk_type;
}
|
78bfe6c3 |
static const char signature[] = "Interplay MVE File\x1A\0\x1A";
|
3ef8be2b |
static int ipmovie_probe(AVProbeData *p)
{ |
23348647 |
const uint8_t *b = p->buf;
const uint8_t *b_end = p->buf + p->buf_size - sizeof(signature); |
61e8efd3 |
do { |
cc4d80c9 |
if (b[0] == signature[0] && memcmp(b, signature, sizeof(signature)) == 0) |
61e8efd3 |
return AVPROBE_SCORE_MAX; |
cc4d80c9 |
b++; |
61e8efd3 |
} while (b < b_end);
return 0; |
3ef8be2b |
}
|
6e9651d1 |
static int ipmovie_read_header(AVFormatContext *s) |
3ef8be2b |
{ |
e4141433 |
IPMVEContext *ipmovie = s->priv_data; |
471fe57e |
AVIOContext *pb = s->pb; |
3ef8be2b |
AVPacket pkt;
AVStream *st; |
dda61423 |
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
ec0dc7e2 |
int chunk_type, i; |
61e8efd3 |
uint8_t signature_buffer[sizeof(signature)];
|
8e0fdb03 |
ipmovie->avf = s;
|
e63a3628 |
avio_read(pb, signature_buffer, sizeof(signature_buffer)); |
61e8efd3 |
while (memcmp(signature_buffer, signature, sizeof(signature))) {
memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1); |
e63a3628 |
signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb); |
d34ec64a |
if (avio_feof(pb)) |
61e8efd3 |
return AVERROR_EOF;
} |
3ef8be2b |
/* initialize private context members */
ipmovie->video_pts = ipmovie->audio_frame_count = 0;
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
ipmovie->decode_map_chunk_offset = 0;
/* on the first read, this will position the stream at the first chunk */ |
384c9c2f |
ipmovie->next_chunk_offset = avio_tell(pb) + 4; |
3ef8be2b |
|
ec0dc7e2 |
for (i = 0; i < 256; i++)
ipmovie->palette[i] = 0xFFU << 24;
|
3ef8be2b |
/* process the first chunk which should be CHUNK_INIT_VIDEO */
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
return AVERROR_INVALIDDATA;
|
dda61423 |
/* peek ahead to the next chunk-- if it is an init audio chunk, process
* it; if it is the first video chunk, this is a silent file */ |
e63a3628 |
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
dda61423 |
CHUNK_PREAMBLE_SIZE) |
6f3e0b21 |
return AVERROR(EIO); |
fead30d4 |
chunk_type = AV_RL16(&chunk_preamble[2]); |
f59d8ff8 |
avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR); |
dda61423 |
if (chunk_type == CHUNK_VIDEO) |
36ef5369 |
ipmovie->audio_type = AV_CODEC_ID_NONE; /* no audio */ |
dda61423 |
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) |
3ef8be2b |
return AVERROR_INVALIDDATA;
/* initialize the stream decoders */ |
3b3bbdd3 |
st = avformat_new_stream(s, NULL); |
3ef8be2b |
if (!st) |
769e10f0 |
return AVERROR(ENOMEM); |
c3f9ebf7 |
avpriv_set_pts_info(st, 63, 1, 1000000); |
3ef8be2b |
ipmovie->video_stream_index = st->index; |
72415b2a |
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
36ef5369 |
st->codec->codec_id = AV_CODEC_ID_INTERPLAY_VIDEO; |
01f4895c |
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = ipmovie->video_width;
st->codec->height = ipmovie->video_height; |
8badb23e |
st->codec->bits_per_coded_sample = ipmovie->video_bpp; |
3ef8be2b |
|
dda61423 |
if (ipmovie->audio_type) { |
e0115383 |
return init_audio(s); |
c3361b3a |
} else
s->ctx_flags |= AVFMTCTX_NOHEADER; |
3ef8be2b |
return 0;
}
static int ipmovie_read_packet(AVFormatContext *s,
AVPacket *pkt)
{ |
e4141433 |
IPMVEContext *ipmovie = s->priv_data; |
471fe57e |
AVIOContext *pb = s->pb; |
3ef8be2b |
int ret;
|
52ef9547 |
for (;;) { |
3ef8be2b |
ret = process_ipmovie_chunk(ipmovie, pb, pkt);
if (ret == CHUNK_BAD)
ret = AVERROR_INVALIDDATA;
else if (ret == CHUNK_EOF) |
6f3e0b21 |
ret = AVERROR(EIO); |
3ef8be2b |
else if (ret == CHUNK_NOMEM) |
769e10f0 |
ret = AVERROR(ENOMEM); |
49c8132b |
else if (ret == CHUNK_VIDEO) |
3ef8be2b |
ret = 0; |
52ef9547 |
else if (ret == CHUNK_INIT_VIDEO || ret == CHUNK_INIT_AUDIO)
continue; |
49c8132b |
else |
c3361b3a |
continue; |
3ef8be2b |
return ret; |
52ef9547 |
} |
3ef8be2b |
}
|
66355be3 |
AVInputFormat ff_ipmovie_demuxer = { |
dfc2c4d9 |
.name = "ipmovie", |
6774247a |
.long_name = NULL_IF_CONFIG_SMALL("Interplay MVE"), |
dfc2c4d9 |
.priv_data_size = sizeof(IPMVEContext),
.read_probe = ipmovie_probe,
.read_header = ipmovie_read_header,
.read_packet = ipmovie_read_packet, |
3ef8be2b |
}; |