/* * Interplay MVE File Demuxer * Copyright (c) 2003 The ffmpeg Project * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @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 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; float 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 (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size)) return CHUNK_EOF; pkt->stream_index = s->audio_stream_index; pkt->pts = audio_pts; /* 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 %"PRId64" (%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; pkt->pos= s->decode_map_chunk_offset; 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; debug_ipmovie("sending video frame with pts %"PRId64"\n", pkt->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; unsigned char r, g, b; /* see if there are any pending packets */ chunk_type = load_ipmovie_packet(s, pb, pkt); if (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 = AV_RL16(&chunk_preamble[0]); chunk_type = AV_RL16(&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 = AV_RL16(&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 = 1000000.0 / (AV_RL32(&scratch[0]) * AV_RL16(&scratch[4])); s->frame_pts_inc = 90000 / s->fps; debug_ipmovie(" %.2f frames/second (timer div = %d, subdiv = %d)\n", s->fps, AV_RL32(&scratch[0]), AV_RL16(&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 = AV_RL16(&scratch[4]); audio_flags = AV_RL16(&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 = AV_RL16(&scratch[0]) * 8; s->video_height = AV_RL16(&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 = AV_RL16(&scratch[0]); last_color = first_color + AV_RL16(&scratch[2]) - 1; /* 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 */ r = scratch[j++] * 4; g = scratch[j++] * 4; b = scratch[j++] * 4; s->palette_control.palette[i] = (r << 16) | (g << 8) | (b); } /* 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 (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 = s->priv_data; ByteIOContext *pb = &s->pb; AVPacket pkt; AVStream *st; unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; int chunk_type; /* 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; /* 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 */ if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != CHUNK_PREAMBLE_SIZE) return AVERROR_IO; chunk_type = AV_RL16(&chunk_preamble[2]); url_fseek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR); if (chunk_type == CHUNK_VIDEO) ipmovie->audio_type = 0; /* no audio */ else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) return AVERROR_INVALIDDATA; /* initialize the stream decoders */ st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); av_set_pts_info(st, 33, 1, 90000); 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->palctrl = &ipmovie->palette_control; if (ipmovie->audio_type) { st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); av_set_pts_info(st, 33, 1, 90000); 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 = 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 = AVERROR_IO; else if (ret == CHUNK_NOMEM) ret = AVERROR(ENOMEM); else if (ret == CHUNK_VIDEO) ret = 0; else ret = -1; return ret; } static int ipmovie_read_close(AVFormatContext *s) { // IPMVEContext *ipmovie = s->priv_data; return 0; } AVInputFormat ipmovie_demuxer = { "ipmovie", "Interplay MVE format", sizeof(IPMVEContext), ipmovie_probe, ipmovie_read_header, ipmovie_read_packet, ipmovie_read_close, };