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ffmpeg / libavformat / ipmovie.c @ 8c653280

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1 3ef8be2b Mike Melanson
/*
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 * Interplay MVE File Demuxer
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 * Copyright (c) 2003 The ffmpeg Project
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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/**
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 * @file ipmovie.c
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 * Interplay MVE file demuxer
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 * by Mike Melanson (melanson@pcisys.net)
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 * For more information regarding the Interplay MVE file format, visit:
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 *   http://www.pcisys.net/~melanson/codecs/
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 * The aforementioned site also contains a command line utility for parsing
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 * IP MVE files so that you can get a good idea of the typical structure of
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 * such files. This demuxer is not the best example to use if you are trying
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 * to write your own as it uses a rather roundabout approach for splitting
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 * up and sending out the chunks.
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 */
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#include "avformat.h"
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/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely
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 * verbose information about the demux process */
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#define DEBUG_IPMOVIE 0
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#if DEBUG_IPMOVIE
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#define debug_ipmovie printf
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#else
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static inline void debug_ipmovie(const char *format, ...) { }
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#endif
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#define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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#define LE_32(x)  ((((uint8_t*)(x))[3] << 24) | \
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                   (((uint8_t*)(x))[2] << 16) | \
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                   (((uint8_t*)(x))[1] << 8) | \
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                    ((uint8_t*)(x))[0])
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#define IPMOVIE_SIGNATURE "Interplay MVE File\x1A\0"
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#define IPMOVIE_SIGNATURE_SIZE 20
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#define CHUNK_PREAMBLE_SIZE 4
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#define OPCODE_PREAMBLE_SIZE 4
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#define CHUNK_INIT_AUDIO   0x0000
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#define CHUNK_AUDIO_ONLY   0x0001
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#define CHUNK_INIT_VIDEO   0x0002
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#define CHUNK_VIDEO        0x0003
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#define CHUNK_SHUTDOWN     0x0004
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#define CHUNK_END          0x0005
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/* these last types are used internally */
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#define CHUNK_DONE         0xFFFC
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#define CHUNK_NOMEM        0xFFFD
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#define CHUNK_EOF          0xFFFE
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#define CHUNK_BAD          0xFFFF
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#define OPCODE_END_OF_STREAM           0x00
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#define OPCODE_END_OF_CHUNK            0x01
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#define OPCODE_CREATE_TIMER            0x02
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#define OPCODE_INIT_AUDIO_BUFFERS      0x03
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#define OPCODE_START_STOP_AUDIO        0x04
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#define OPCODE_INIT_VIDEO_BUFFERS      0x05
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#define OPCODE_UNKNOWN_06              0x06
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#define OPCODE_SEND_BUFFER             0x07
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#define OPCODE_AUDIO_FRAME             0x08
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#define OPCODE_SILENCE_FRAME           0x09
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#define OPCODE_INIT_VIDEO_MODE         0x0A
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#define OPCODE_CREATE_GRADIENT         0x0B
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#define OPCODE_SET_PALETTE             0x0C
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#define OPCODE_SET_PALETTE_COMPRESSED  0x0D
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#define OPCODE_UNKNOWN_0E              0x0E
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#define OPCODE_SET_DECODING_MAP        0x0F
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#define OPCODE_UNKNOWN_10              0x10
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#define OPCODE_VIDEO_DATA              0x11
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#define OPCODE_UNKNOWN_12              0x12
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#define OPCODE_UNKNOWN_13              0x13
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#define OPCODE_UNKNOWN_14              0x14
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#define OPCODE_UNKNOWN_15              0x15
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#define PALETTE_COUNT 256
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typedef struct IPMVEContext {
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    unsigned char *buf;
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    int buf_size;
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    int fps;
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    int frame_pts_inc;
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    unsigned int video_width;
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    unsigned int video_height;
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    int64_t video_pts;
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    unsigned int audio_bits;
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    unsigned int audio_channels;
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    unsigned int audio_sample_rate;
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    unsigned int audio_type;
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    unsigned int audio_frame_count;
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    int video_stream_index;
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    int audio_stream_index;
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    offset_t audio_chunk_offset;
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    int audio_chunk_size;
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    offset_t video_chunk_offset;
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    int video_chunk_size;
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    offset_t decode_map_chunk_offset;
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    int decode_map_chunk_size;
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    offset_t next_chunk_offset;
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} IPMVEContext;
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static int load_ipmovie_packet(IPMVEContext *s, ByteIOContext *pb, 
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    AVPacket *pkt) {
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    int chunk_type;
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    int64_t audio_pts = 0;
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    if (s->audio_chunk_offset) {
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        url_fseek(pb, s->audio_chunk_offset, SEEK_SET);
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        s->audio_chunk_offset = 0;
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        /* figure out the audio pts */
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        audio_pts = 90000;
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        audio_pts *= s->audio_frame_count;
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        audio_pts /= s->audio_sample_rate;
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        if (av_new_packet(pkt, s->audio_chunk_size))
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            return CHUNK_NOMEM;
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        pkt->stream_index = s->audio_stream_index;
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        pkt->pts = audio_pts;
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        if (get_buffer(pb, pkt->data, s->audio_chunk_size) != 
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            s->audio_chunk_size) {
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            av_free_packet(pkt);
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            return CHUNK_EOF;
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        }
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        /* audio frame maintenance */
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        if (s->audio_type != CODEC_ID_INTERPLAY_DPCM)
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            s->audio_frame_count +=
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            (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
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        else
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            s->audio_frame_count +=
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                (s->audio_chunk_size - 6) / s->audio_channels;
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        debug_ipmovie("sending audio frame with pts %lld (%d audio frames)\n",
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            audio_pts, s->audio_frame_count);
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        chunk_type = CHUNK_VIDEO;
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    } else if (s->decode_map_chunk_offset) {
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        url_fseek(pb, s->decode_map_chunk_offset, SEEK_SET);
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        s->decode_map_chunk_offset = 0;
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        if (av_new_packet(pkt, s->decode_map_chunk_size))
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            return CHUNK_NOMEM;
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        pkt->stream_index = s->video_stream_index;
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        pkt->pts = s->video_pts;
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        if (get_buffer(pb, pkt->data, s->decode_map_chunk_size) != 
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            s->decode_map_chunk_size) {
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            av_free_packet(pkt);
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            return CHUNK_EOF;
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        }
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        chunk_type = CHUNK_VIDEO;
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    } else if (s->video_chunk_offset) {
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        url_fseek(pb, s->video_chunk_offset, SEEK_SET);
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        s->video_chunk_offset = 0;
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        if (av_new_packet(pkt, s->video_chunk_size))
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            return CHUNK_NOMEM;
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        pkt->stream_index = s->video_stream_index;
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        pkt->pts = s->video_pts;
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        if (get_buffer(pb, pkt->data, s->video_chunk_size) != 
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            s->video_chunk_size) {
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            av_free_packet(pkt);
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            return CHUNK_EOF;
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        }
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        s->video_pts += s->frame_pts_inc;
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        chunk_type = CHUNK_VIDEO;
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    } else {
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        url_fseek(pb, s->next_chunk_offset, SEEK_SET);
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        chunk_type = CHUNK_DONE;
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    }
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    return chunk_type;
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}
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/* This function loads and processes a single chunk in an IP movie file.
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 * It returns the type of chunk that was processed. */
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static int process_ipmovie_chunk(IPMVEContext *s, ByteIOContext *pb, 
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    AVPacket *pkt)
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{
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    unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
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    int chunk_type;
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    int chunk_size;
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    unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
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    unsigned char opcode_type;
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    unsigned char opcode_version;
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    int opcode_size;
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    unsigned char scratch[1024];
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    int j;
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    int first_color, last_color;
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    int audio_flags;
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    /* see if there are any pending packets */
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    chunk_type = load_ipmovie_packet(s, pb, pkt);
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    if ((chunk_type == CHUNK_VIDEO) && (chunk_type != CHUNK_DONE))
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        return chunk_type;
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    /* read the next chunk, wherever the file happens to be pointing */
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    if (url_feof(pb))
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        return CHUNK_EOF;
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    if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
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        CHUNK_PREAMBLE_SIZE)
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        return CHUNK_BAD;
242
    chunk_size = LE_16(&chunk_preamble[0]);
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    chunk_type = LE_16(&chunk_preamble[2]);
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    debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
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    switch (chunk_type) {
248
249
    case CHUNK_INIT_AUDIO:
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        debug_ipmovie("initialize audio\n");
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        break;
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    case CHUNK_AUDIO_ONLY:
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        debug_ipmovie("audio only\n");
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        break;
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    case CHUNK_INIT_VIDEO:
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        debug_ipmovie("initialize video\n");
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        break;
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    case CHUNK_VIDEO:
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        debug_ipmovie("video (and audio)\n");
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        break;
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    case CHUNK_SHUTDOWN:
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        debug_ipmovie("shutdown\n");
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        break;
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    case CHUNK_END:
270
        debug_ipmovie("end\n");
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        break;
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    default:
274
        debug_ipmovie("invalid chunk\n");
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        chunk_type = CHUNK_BAD;
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        break;
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    }
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    while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
281
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        /* read the next chunk, wherever the file happens to be pointing */
283
       if (url_feof(pb)) {
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            chunk_type = CHUNK_EOF;
285
            break;
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        }
287
        if (get_buffer(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
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            CHUNK_PREAMBLE_SIZE) {
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            chunk_type = CHUNK_BAD;
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            break;
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        }
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        opcode_size = LE_16(&opcode_preamble[0]);
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        opcode_type = opcode_preamble[2];
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        opcode_version = opcode_preamble[3];
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        chunk_size -= OPCODE_PREAMBLE_SIZE;
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        chunk_size -= opcode_size;
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        if (chunk_size < 0) {
300
            debug_ipmovie("chunk_size countdown just went negative\n");
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            chunk_type = CHUNK_BAD;
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            break;
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        }
304
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        debug_ipmovie("  opcode type %02X, version %d, 0x%04X bytes: ",
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            opcode_type, opcode_version, opcode_size);
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        switch (opcode_type) {
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        case OPCODE_END_OF_STREAM:
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            debug_ipmovie("end of stream\n");
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            url_fseek(pb, opcode_size, SEEK_CUR);
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            break;
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        case OPCODE_END_OF_CHUNK:
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            debug_ipmovie("end of chunk\n");
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            url_fseek(pb, opcode_size, SEEK_CUR);
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            break;
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319
        case OPCODE_CREATE_TIMER:
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            debug_ipmovie("create timer\n");
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            if ((opcode_version > 0) || (opcode_size > 6)) {
322
                debug_ipmovie("bad create_timer opcode\n");
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                chunk_type = CHUNK_BAD;
324
                break;
325
            }
326
            if (get_buffer(pb, scratch, opcode_size) !=
327
                opcode_size) {
328
                chunk_type = CHUNK_BAD;
329
                break;
330
            }
331
            s->fps = 1000000 / (LE_32(&scratch[0]) * LE_16(&scratch[4]));
332
            s->fps++;  /* above calculation usually yields 14.9; we need 15 */
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            s->frame_pts_inc = 90000 / s->fps;
334
            debug_ipmovie("%d frames/second (timer div = %d, subdiv = %d)\n",
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                s->fps, LE_32(&scratch[0]), LE_16(&scratch[4]));
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            break;
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338
        case OPCODE_INIT_AUDIO_BUFFERS:
339
            debug_ipmovie("initialize audio buffers\n");
340
            if ((opcode_version > 1) || (opcode_size > 10)) {
341
                debug_ipmovie("bad init_audio_buffers opcode\n");
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                chunk_type = CHUNK_BAD;
343
                break;
344
            }
345
            if (get_buffer(pb, scratch, opcode_size) !=
346
                opcode_size) {
347
                chunk_type = CHUNK_BAD;
348
                break;
349
            }
350
            s->audio_sample_rate = LE_16(&scratch[4]);
351
            audio_flags = LE_16(&scratch[2]);
352
            /* bit 0 of the flags: 0 = mono, 1 = stereo */
353
            s->audio_channels = (audio_flags & 1) + 1;
354
            /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
355
            s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
356
            /* bit 2 indicates compressed audio in version 1 opcode */
357
            if ((opcode_version == 1) && (audio_flags & 0x4))
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                s->audio_type = CODEC_ID_INTERPLAY_DPCM;
359
            else if (s->audio_bits == 16)
360
                s->audio_type = CODEC_ID_PCM_S16LE;
361
            else
362
                s->audio_type = CODEC_ID_PCM_U8;
363
            debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n",
364
                s->audio_bits,
365
                s->audio_sample_rate,
366
                (s->audio_channels == 2) ? "stereo" : "mono",
367
                (s->audio_type == CODEC_ID_INTERPLAY_DPCM) ? 
368
                "Interplay audio" : "PCM");
369
            break;
370
371
        case OPCODE_START_STOP_AUDIO:
372
            debug_ipmovie("start/stop audio\n");
373
            url_fseek(pb, opcode_size, SEEK_CUR);
374
            break;
375
376
        case OPCODE_INIT_VIDEO_BUFFERS:
377
            debug_ipmovie("initialize video buffers\n");
378
            if ((opcode_version > 2) || (opcode_size > 8)) {
379
                debug_ipmovie("bad init_video_buffers opcode\n");
380
                chunk_type = CHUNK_BAD;
381
                break;
382
            }
383
            if (get_buffer(pb, scratch, opcode_size) !=
384
                opcode_size) {
385
                chunk_type = CHUNK_BAD;
386
                break;
387
            }
388
            s->video_width = LE_16(&scratch[0]) * 8;
389
            s->video_height = LE_16(&scratch[2]) * 8;
390
            debug_ipmovie("video resolution: %d x %d\n",
391
                s->video_width, s->video_height);
392
            break;
393
394
        case OPCODE_UNKNOWN_06:
395
        case OPCODE_UNKNOWN_0E:
396
        case OPCODE_UNKNOWN_10:
397
        case OPCODE_UNKNOWN_12:
398
        case OPCODE_UNKNOWN_13:
399
        case OPCODE_UNKNOWN_14:
400
        case OPCODE_UNKNOWN_15:
401
            debug_ipmovie("unknown (but documented) opcode %02X\n", opcode_type);
402
            url_fseek(pb, opcode_size, SEEK_CUR);
403
            break;
404
405
        case OPCODE_SEND_BUFFER:
406
            debug_ipmovie("send buffer\n");
407
            url_fseek(pb, opcode_size, SEEK_CUR);
408
            break;
409
410
        case OPCODE_AUDIO_FRAME:
411
            debug_ipmovie("audio frame\n");
412
413
            /* log position and move on for now */
414
            s->audio_chunk_offset = url_ftell(pb);
415
            s->audio_chunk_size = opcode_size;
416
            url_fseek(pb, opcode_size, SEEK_CUR);
417
            break;
418
419
        case OPCODE_SILENCE_FRAME:
420
            debug_ipmovie("silence frame\n");
421
            url_fseek(pb, opcode_size, SEEK_CUR);
422
            break;
423
424
        case OPCODE_INIT_VIDEO_MODE:
425
            debug_ipmovie("initialize video mode\n");
426
            url_fseek(pb, opcode_size, SEEK_CUR);
427
            break;
428
429
        case OPCODE_CREATE_GRADIENT:
430
            debug_ipmovie("create gradient\n");
431
            url_fseek(pb, opcode_size, SEEK_CUR);
432
            break;
433
434
        case OPCODE_SET_PALETTE:
435
            debug_ipmovie("set palette\n");
436
            /* check for the logical maximum palette size
437
             * (3 * 256 + 4 bytes) */
438
            if (opcode_size > 0x304) {
439
                debug_ipmovie("demux_ipmovie: set_palette opcode too large\n");
440
                chunk_type = CHUNK_BAD;
441
                break;
442
            }
443
            if (get_buffer(pb, scratch, opcode_size) != opcode_size) {
444
                chunk_type = CHUNK_BAD;
445
                break;
446
            }
447
448
            /* load the palette into internal data structure */
449
            first_color = LE_16(&scratch[0]);
450
            last_color = LE_16(&scratch[2]);
451
            /* sanity check (since they are 16 bit values) */
452
            if ((first_color > 0xFF) || (last_color > 0xFF)) {
453
                debug_ipmovie("demux_ipmovie: set_palette indices out of range (%d -> %d)\n",
454
                    first_color, last_color);
455
                chunk_type = CHUNK_BAD;
456
                break;
457
            }
458
            j = 4;  /* offset of first palette data */
459
#if 0
460
            for (i = first_color; i <= last_color; i++) {
461
                s->palette[i].r = scratch[j++] * 4;
462
                s->palette[i].g = scratch[j++] * 4;
463
                s->palette[i].b = scratch[j++] * 4;
464
            }
465
#endif
466
            break;
467
468
        case OPCODE_SET_PALETTE_COMPRESSED:
469
            debug_ipmovie("set palette compressed\n");
470
            url_fseek(pb, opcode_size, SEEK_CUR);
471
            break;
472
473
        case OPCODE_SET_DECODING_MAP:
474
            debug_ipmovie("set decoding map\n");
475
476
            /* log position and move on for now */
477
            s->decode_map_chunk_offset = url_ftell(pb);
478
            s->decode_map_chunk_size = opcode_size;
479
            url_fseek(pb, opcode_size, SEEK_CUR);
480
            break;
481
482
        case OPCODE_VIDEO_DATA:
483
            debug_ipmovie("set video data\n");
484
485
            /* log position and move on for now */
486
            s->video_chunk_offset = url_ftell(pb);
487
            s->video_chunk_size = opcode_size;
488
            url_fseek(pb, opcode_size, SEEK_CUR);
489
            break;
490
491
        default:
492
            debug_ipmovie("*** unknown opcode type\n");
493
            chunk_type = CHUNK_BAD;
494
            break;
495
496
        }
497
    }
498
499
    /* make a note of where the stream is sitting */
500
    s->next_chunk_offset = url_ftell(pb);
501
502
    /* dispatch the first of any pending packets */
503
    if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY))
504
        chunk_type = load_ipmovie_packet(s, pb, pkt);
505
506
    return chunk_type;
507
}
508
509
static int ipmovie_probe(AVProbeData *p)
510
{
511
    if (p->buf_size < IPMOVIE_SIGNATURE_SIZE)
512
        return 0;
513
    if (strncmp(p->buf, IPMOVIE_SIGNATURE, IPMOVIE_SIGNATURE_SIZE) != 0)
514
        return 0;
515
516
    return AVPROBE_SCORE_MAX;
517
}
518
519
static int ipmovie_read_header(AVFormatContext *s,
520
                               AVFormatParameters *ap)
521
{
522
    IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
523
    ByteIOContext *pb = &s->pb;
524
    AVPacket pkt;
525
    AVStream *st;
526
527
    /* initialize private context members */
528
    ipmovie->video_pts = ipmovie->audio_frame_count = 0;
529
    ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
530
    ipmovie->decode_map_chunk_offset = 0;
531
532
    /* on the first read, this will position the stream at the first chunk */
533
    ipmovie->next_chunk_offset = IPMOVIE_SIGNATURE_SIZE + 6;
534
535
    /* process the first chunk which should be CHUNK_INIT_VIDEO */
536
    if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
537
        return AVERROR_INVALIDDATA;
538
539
    /* process the next chunk which should be CHUNK_INIT_AUDIO */
540
    if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
541
        return AVERROR_INVALIDDATA;
542
543
    /* set the pts reference (1 pts = 1/90000) */
544
    s->pts_num = 1;
545
    s->pts_den = 90000;
546
547
    /* initialize the stream decoders */
548
    st = av_new_stream(s, 0);
549
    if (!st)
550
        return AVERROR_NOMEM;
551
    ipmovie->video_stream_index = st->index;
552
    st->codec.codec_type = CODEC_TYPE_VIDEO;
553
    st->codec.codec_id = CODEC_ID_INTERPLAY_VIDEO;
554
    st->codec.codec_tag = 0;  /* no fourcc */
555
    st->codec.width = ipmovie->video_width;
556
    st->codec.height = ipmovie->video_height;
557
558
    st = av_new_stream(s, 0);
559
    if (!st)
560
        return AVERROR_NOMEM;
561
    ipmovie->audio_stream_index = st->index;
562
    st->codec.codec_type = CODEC_TYPE_AUDIO;
563
    st->codec.codec_id = ipmovie->audio_type;
564
    st->codec.codec_tag = 0;  /* no tag */
565
    st->codec.channels = ipmovie->audio_channels;
566
    st->codec.sample_rate = ipmovie->audio_sample_rate;
567
    st->codec.bits_per_sample = ipmovie->audio_bits;
568
    st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
569
        st->codec.bits_per_sample / 
570
        (st->codec.codec_id == CODEC_ID_INTERPLAY_DPCM) ? 2 : 1;
571
    st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
572
573
    return 0;
574
}
575
576
static int ipmovie_read_packet(AVFormatContext *s,
577
                               AVPacket *pkt)
578
{
579
    IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
580
    ByteIOContext *pb = &s->pb;
581
    int ret;
582
583
    ret = process_ipmovie_chunk(ipmovie, pb, pkt);
584
    if (ret == CHUNK_BAD)
585
        ret = AVERROR_INVALIDDATA;
586
    else if (ret == CHUNK_EOF)
587
        ret = -EIO;
588
    else if (ret == CHUNK_NOMEM)
589
        ret = AVERROR_NOMEM;
590
    else
591
        ret = 0;
592
593
    return ret;
594
}
595
596
static int ipmovie_read_close(AVFormatContext *s)
597
{
598
//    IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
599
600
    return 0;
601
}
602
603
static AVInputFormat ipmovie_iformat = {
604
    "ipmovie",
605
    "Interplay MVE format",
606
    sizeof(IPMVEContext),
607
    ipmovie_probe,
608
    ipmovie_read_header,
609
    ipmovie_read_packet,
610
    ipmovie_read_close,
611
};
612
613
int ipmovie_init(void)
614
{
615
    av_register_input_format(&ipmovie_iformat);
616
    return 0;
617
}