--- /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