+++ /dev/null
-/*
- * Interplay MVE File Demuxer
- * Copyright (c) 2003 The ffmpeg Project
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/**
- * @file ipmovie.c
- * 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.
- */
-
-#include "avformat.h"
-
-/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely
- * verbose information about the demux process */
-#define DEBUG_IPMOVIE 0
-
-#if DEBUG_IPMOVIE
-#define debug_ipmovie printf
-#else
-static inline void debug_ipmovie(const char *format, ...) { }
-#endif
-
-
-#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
-#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
- (((uint8_t*)(x))[2] << 16) | \
- (((uint8_t*)(x))[1] << 8) | \
- ((uint8_t*)(x))[0])
-
-#define IPMOVIE_SIGNATURE "Interplay MVE File\x1A\0"
-#define IPMOVIE_SIGNATURE_SIZE 20
-#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 {
-
- unsigned char *buf;
- int buf_size;
-
- int fps;
- int frame_pts_inc;
-
- unsigned int video_width;
- unsigned int video_height;
- int64_t video_pts;
-
- unsigned int audio_bits;
- unsigned int audio_channels;
- unsigned int audio_sample_rate;
- unsigned int audio_type;
- unsigned int audio_frame_count;
-
- int video_stream_index;
- int audio_stream_index;
-
- offset_t audio_chunk_offset;
- int audio_chunk_size;
- offset_t video_chunk_offset;
- int video_chunk_size;
- offset_t decode_map_chunk_offset;
- int decode_map_chunk_size;
-
- offset_t next_chunk_offset;
-
- AVPaletteControl palette_control;
-
-} IPMVEContext;
-
-static int load_ipmovie_packet(IPMVEContext *s, ByteIOContext *pb,
- AVPacket *pkt) {
-
- int chunk_type;
- int64_t audio_pts = 0;
-
- if (s->audio_chunk_offset) {
-
- /* adjust for PCM audio by skipping chunk header */
- if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) {
- s->audio_chunk_offset += 6;
- s->audio_chunk_size -= 6;
- }
-
- url_fseek(pb, s->audio_chunk_offset, SEEK_SET);
- s->audio_chunk_offset = 0;
-
- /* figure out the audio pts */
- audio_pts = 90000;
- audio_pts *= s->audio_frame_count;
- audio_pts /= s->audio_sample_rate;
-
- if (av_new_packet(pkt, s->audio_chunk_size))
- return CHUNK_NOMEM;
-
- pkt->stream_index = s->audio_stream_index;
- pkt->pts = audio_pts;
- if (get_buffer(pb, pkt->data, s->audio_chunk_size) !=
- s->audio_chunk_size) {
- av_free_packet(pkt);
- return CHUNK_EOF;
- }
-
- /* audio frame maintenance */
- if (s->audio_type != CODEC_ID_INTERPLAY_DPCM)
- s->audio_frame_count +=
- (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
- else
- s->audio_frame_count +=
- (s->audio_chunk_size - 6) / s->audio_channels;
-
- debug_ipmovie("sending audio frame with pts %lld (%d audio frames)\n",
- audio_pts, s->audio_frame_count);
-
- chunk_type = CHUNK_VIDEO;
-
- } else if (s->decode_map_chunk_offset) {
-
- /* send both the decode map and the video data together */
-
- if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size))
- return CHUNK_NOMEM;
-
- url_fseek(pb, s->decode_map_chunk_offset, SEEK_SET);
- s->decode_map_chunk_offset = 0;
-
- if (get_buffer(pb, pkt->data, s->decode_map_chunk_size) !=
- s->decode_map_chunk_size) {
- av_free_packet(pkt);
- return CHUNK_EOF;
- }
-
- url_fseek(pb, s->video_chunk_offset, SEEK_SET);
- s->video_chunk_offset = 0;
-
- if (get_buffer(pb, pkt->data + s->decode_map_chunk_size,
- s->video_chunk_size) != s->video_chunk_size) {
- av_free_packet(pkt);
- return CHUNK_EOF;
- }
-
- pkt->stream_index = s->video_stream_index;
- pkt->pts = s->video_pts;
-
- s->video_pts += s->frame_pts_inc;
-
- chunk_type = CHUNK_VIDEO;
-
- } else {
-
- url_fseek(pb, s->next_chunk_offset, SEEK_SET);
- chunk_type = CHUNK_DONE;
-
- }
-
- return chunk_type;
-}
-
-/* This function loads and processes a single chunk in an IP movie file.
- * It returns the type of chunk that was processed. */
-static int process_ipmovie_chunk(IPMVEContext *s, ByteIOContext *pb,
- 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];
- int i, j;
- int first_color, last_color;
- int audio_flags;
-
- /* see if there are any pending packets */
- chunk_type = load_ipmovie_packet(s, pb, pkt);
- if ((chunk_type == CHUNK_VIDEO) && (chunk_type != CHUNK_DONE))
- return chunk_type;
-
- /* read the next chunk, wherever the file happens to be pointing */
- if (url_feof(pb))
- return CHUNK_EOF;
- if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
- CHUNK_PREAMBLE_SIZE)
- return CHUNK_BAD;
- chunk_size = LE_16(&chunk_preamble[0]);
- chunk_type = LE_16(&chunk_preamble[2]);
-
- debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
-
- switch (chunk_type) {
-
- case CHUNK_INIT_AUDIO:
- debug_ipmovie("initialize audio\n");
- break;
-
- case CHUNK_AUDIO_ONLY:
- debug_ipmovie("audio only\n");
- break;
-
- case CHUNK_INIT_VIDEO:
- debug_ipmovie("initialize video\n");
- break;
-
- case CHUNK_VIDEO:
- debug_ipmovie("video (and audio)\n");
- break;
-
- case CHUNK_SHUTDOWN:
- debug_ipmovie("shutdown\n");
- break;
-
- case CHUNK_END:
- debug_ipmovie("end\n");
- break;
-
- default:
- debug_ipmovie("invalid chunk\n");
- chunk_type = CHUNK_BAD;
- break;
-
- }
-
- while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
-
- /* read the next chunk, wherever the file happens to be pointing */
- if (url_feof(pb)) {
- chunk_type = CHUNK_EOF;
- break;
- }
- if (get_buffer(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
- CHUNK_PREAMBLE_SIZE) {
- chunk_type = CHUNK_BAD;
- break;
- }
-
- opcode_size = LE_16(&opcode_preamble[0]);
- opcode_type = opcode_preamble[2];
- opcode_version = opcode_preamble[3];
-
- chunk_size -= OPCODE_PREAMBLE_SIZE;
- chunk_size -= opcode_size;
- if (chunk_size < 0) {
- debug_ipmovie("chunk_size countdown just went negative\n");
- chunk_type = CHUNK_BAD;
- break;
- }
-
- debug_ipmovie(" opcode type %02X, version %d, 0x%04X bytes: ",
- opcode_type, opcode_version, opcode_size);
- switch (opcode_type) {
-
- case OPCODE_END_OF_STREAM:
- debug_ipmovie("end of stream\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_END_OF_CHUNK:
- debug_ipmovie("end of chunk\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_CREATE_TIMER:
- debug_ipmovie("create timer\n");
- if ((opcode_version > 0) || (opcode_size > 6)) {
- debug_ipmovie("bad create_timer opcode\n");
- chunk_type = CHUNK_BAD;
- break;
- }
- if (get_buffer(pb, scratch, opcode_size) !=
- opcode_size) {
- chunk_type = CHUNK_BAD;
- break;
- }
- s->fps = 1000000 / (LE_32(&scratch[0]) * LE_16(&scratch[4]));
- s->fps++; /* above calculation usually yields 14.9; we need 15 */
- s->frame_pts_inc = 90000 / s->fps;
- debug_ipmovie("%d frames/second (timer div = %d, subdiv = %d)\n",
- s->fps, LE_32(&scratch[0]), LE_16(&scratch[4]));
- break;
-
- case OPCODE_INIT_AUDIO_BUFFERS:
- debug_ipmovie("initialize audio buffers\n");
- if ((opcode_version > 1) || (opcode_size > 10)) {
- debug_ipmovie("bad init_audio_buffers opcode\n");
- chunk_type = CHUNK_BAD;
- break;
- }
- if (get_buffer(pb, scratch, opcode_size) !=
- opcode_size) {
- chunk_type = CHUNK_BAD;
- break;
- }
- s->audio_sample_rate = LE_16(&scratch[4]);
- audio_flags = LE_16(&scratch[2]);
- /* 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))
- s->audio_type = CODEC_ID_INTERPLAY_DPCM;
- else if (s->audio_bits == 16)
- s->audio_type = CODEC_ID_PCM_S16LE;
- else
- s->audio_type = CODEC_ID_PCM_U8;
- debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n",
- s->audio_bits,
- s->audio_sample_rate,
- (s->audio_channels == 2) ? "stereo" : "mono",
- (s->audio_type == CODEC_ID_INTERPLAY_DPCM) ?
- "Interplay audio" : "PCM");
- break;
-
- case OPCODE_START_STOP_AUDIO:
- debug_ipmovie("start/stop audio\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_INIT_VIDEO_BUFFERS:
- debug_ipmovie("initialize video buffers\n");
- if ((opcode_version > 2) || (opcode_size > 8)) {
- debug_ipmovie("bad init_video_buffers opcode\n");
- chunk_type = CHUNK_BAD;
- break;
- }
- if (get_buffer(pb, scratch, opcode_size) !=
- opcode_size) {
- chunk_type = CHUNK_BAD;
- break;
- }
- s->video_width = LE_16(&scratch[0]) * 8;
- s->video_height = LE_16(&scratch[2]) * 8;
- debug_ipmovie("video resolution: %d x %d\n",
- s->video_width, s->video_height);
- 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:
- debug_ipmovie("unknown (but documented) opcode %02X\n", opcode_type);
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_SEND_BUFFER:
- debug_ipmovie("send buffer\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_AUDIO_FRAME:
- debug_ipmovie("audio frame\n");
-
- /* log position and move on for now */
- s->audio_chunk_offset = url_ftell(pb);
- s->audio_chunk_size = opcode_size;
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_SILENCE_FRAME:
- debug_ipmovie("silence frame\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_INIT_VIDEO_MODE:
- debug_ipmovie("initialize video mode\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_CREATE_GRADIENT:
- debug_ipmovie("create gradient\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_SET_PALETTE:
- debug_ipmovie("set palette\n");
- /* check for the logical maximum palette size
- * (3 * 256 + 4 bytes) */
- if (opcode_size > 0x304) {
- debug_ipmovie("demux_ipmovie: set_palette opcode too large\n");
- chunk_type = CHUNK_BAD;
- break;
- }
- if (get_buffer(pb, scratch, opcode_size) != opcode_size) {
- chunk_type = CHUNK_BAD;
- break;
- }
-
- /* load the palette into internal data structure */
- first_color = LE_16(&scratch[0]);
- last_color = first_color + LE_16(&scratch[2]);
- /* sanity check (since they are 16 bit values) */
- if ((first_color > 0xFF) || (last_color > 0xFF)) {
- debug_ipmovie("demux_ipmovie: set_palette indices out of range (%d -> %d)\n",
- first_color, last_color);
- chunk_type = CHUNK_BAD;
- break;
- }
- j = 4; /* offset of first palette data */
- for (i = first_color; i <= last_color; i++) {
- /* the palette is stored as a 6-bit VGA palette, thus each
- * component is shifted up to a 8-bit range */
- s->palette_control.palette[i * 3 + 0] = scratch[j++] * 4;
- s->palette_control.palette[i * 3 + 1] = scratch[j++] * 4;
- s->palette_control.palette[i * 3 + 2] = scratch[j++] * 4;
- }
- /* indicate a palette change */
- s->palette_control.palette_changed = 1;
- break;
-
- case OPCODE_SET_PALETTE_COMPRESSED:
- debug_ipmovie("set palette compressed\n");
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_SET_DECODING_MAP:
- debug_ipmovie("set decoding map\n");
-
- /* log position and move on for now */
- s->decode_map_chunk_offset = url_ftell(pb);
- s->decode_map_chunk_size = opcode_size;
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- case OPCODE_VIDEO_DATA:
- debug_ipmovie("set video data\n");
-
- /* log position and move on for now */
- s->video_chunk_offset = url_ftell(pb);
- s->video_chunk_size = opcode_size;
- url_fseek(pb, opcode_size, SEEK_CUR);
- break;
-
- default:
- debug_ipmovie("*** unknown opcode type\n");
- chunk_type = CHUNK_BAD;
- break;
-
- }
- }
-
- /* make a note of where the stream is sitting */
- s->next_chunk_offset = url_ftell(pb);
-
- /* 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;
-}
-
-static int ipmovie_probe(AVProbeData *p)
-{
- if (p->buf_size < IPMOVIE_SIGNATURE_SIZE)
- return 0;
- if (strncmp(p->buf, IPMOVIE_SIGNATURE, IPMOVIE_SIGNATURE_SIZE) != 0)
- return 0;
-
- return AVPROBE_SCORE_MAX;
-}
-
-static int ipmovie_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
- ByteIOContext *pb = &s->pb;
- AVPacket pkt;
- AVStream *st;
-
- /* 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 */
- ipmovie->next_chunk_offset = IPMOVIE_SIGNATURE_SIZE + 6;
-
- /* process the first chunk which should be CHUNK_INIT_VIDEO */
- if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
- return AVERROR_INVALIDDATA;
-
- /* process the next chunk which should be CHUNK_INIT_AUDIO */
- if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
- return AVERROR_INVALIDDATA;
-
- /* set the pts reference (1 pts = 1/90000) */
- s->pts_num = 1;
- s->pts_den = 90000;
-
- /* initialize the stream decoders */
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR_NOMEM;
- ipmovie->video_stream_index = st->index;
- st->codec.codec_type = CODEC_TYPE_VIDEO;
- st->codec.codec_id = CODEC_ID_INTERPLAY_VIDEO;
- st->codec.codec_tag = 0; /* no fourcc */
- st->codec.width = ipmovie->video_width;
- st->codec.height = ipmovie->video_height;
-
- /* palette considerations */
- st->codec.extradata_size = sizeof(AVPaletteControl);
- st->codec.extradata = &ipmovie->palette_control;
-
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR_NOMEM;
- ipmovie->audio_stream_index = st->index;
- st->codec.codec_type = CODEC_TYPE_AUDIO;
- st->codec.codec_id = ipmovie->audio_type;
- st->codec.codec_tag = 0; /* no tag */
- st->codec.channels = ipmovie->audio_channels;
- st->codec.sample_rate = ipmovie->audio_sample_rate;
- st->codec.bits_per_sample = ipmovie->audio_bits;
- st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
- st->codec.bits_per_sample;
- if (st->codec.codec_id == CODEC_ID_INTERPLAY_DPCM)
- st->codec.bit_rate /= 2;
- st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
-
- return 0;
-}
-
-static int ipmovie_read_packet(AVFormatContext *s,
- AVPacket *pkt)
-{
- IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
- ByteIOContext *pb = &s->pb;
- int ret;
-
- ret = process_ipmovie_chunk(ipmovie, pb, pkt);
- if (ret == CHUNK_BAD)
- ret = AVERROR_INVALIDDATA;
- else if (ret == CHUNK_EOF)
- ret = -EIO;
- else if (ret == CHUNK_NOMEM)
- ret = AVERROR_NOMEM;
- else
- ret = 0;
-
- return ret;
-}
-
-static int ipmovie_read_close(AVFormatContext *s)
-{
-// IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
-
- return 0;
-}
-
-static AVInputFormat ipmovie_iformat = {
- "ipmovie",
- "Interplay MVE format",
- sizeof(IPMVEContext),
- ipmovie_probe,
- ipmovie_read_header,
- ipmovie_read_packet,
- ipmovie_read_close,
-};
-
-int ipmovie_init(void)
-{
- av_register_input_format(&ipmovie_iformat);
- return 0;
-}
-
projects / synfig.git / blobdiff