/src/ffmpeg/libavformat/mvdec.c

Source
/*
 * Silicon Graphics Movie demuxer
 * Copyright (c) 2012 Peter Ross
 *
 * 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
 * Silicon Graphics Movie demuxer
 */

#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/rational.h"

#include "avformat.h"
#include "demux.h"
#include "internal.h"

typedef struct MvContext {
    int nb_video_tracks;
    int nb_audio_tracks;

    int eof_count;        ///< number of streams that have finished
    int stream_index;     ///< current stream index
    int frame[2];         ///< frame nb for current stream

    int acompression;     ///< compression level for audio stream
    int aformat;          ///< audio format
} MvContext;

/* these magic numbers are defined in moviefile.h on Silicon Graphics IRIX */
#define MOVIE_SOUND  1
#define MOVIE_SILENT 2

#define AUDIO_FORMAT_SIGNED 401

static int mv_probe(const AVProbeData *p)
{
    if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
        AV_RB16(p->buf + 4) < 3)
        return AVPROBE_SCORE_MAX;
    return 0;
}

static char *var_read_string(AVIOContext *pb, int size)
{
    int n;
    char *str;

    if (size < 0 || size == INT_MAX)
        return NULL;

    str = av_malloc(size + 1);
    if (!str)
        return NULL;
    n = avio_get_str(pb, size, str, size + 1);
    if (n < size)
        avio_skip(pb, size - n);
    return str;
}

static int var_read_int(AVIOContext *pb, int size)
{
    int v;
    char *s = var_read_string(pb, size);
    if (!s)
        return 0;
    v = strtol(s, NULL, 10);
    av_free(s);
    return v;
}

static AVRational var_read_float(AVIOContext *pb, int size)
{
    AVRational v;
    char *s = var_read_string(pb, size);
    if (!s)
        return (AVRational) { 0, 0 };
    v = av_d2q(av_strtod(s, NULL), INT_MAX);
    av_free(s);
    return v;
}

static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
{
    char *value = var_read_string(avctx->pb, size);
    if (value)
        av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
}

static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
{
    if (channels <= 0) {
        av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
        return AVERROR_INVALIDDATA;
    }
    av_channel_layout_default(&st->codecpar->ch_layout, channels);
    return 0;
}

/**
 * Parse global variable
 * @return < 0 if unknown
 */
static int parse_global_var(AVFormatContext *avctx, AVStream *st,
                            const char *name, int size)
{
    MvContext *mv = avctx->priv_data;
    AVIOContext *pb = avctx->pb;
    if (!strcmp(name, "__NUM_I_TRACKS")) {
        mv->nb_video_tracks = var_read_int(pb, size);
    } else if (!strcmp(name, "__NUM_A_TRACKS")) {
        mv->nb_audio_tracks = var_read_int(pb, size);
    } else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
        var_read_metadata(avctx, name, size);
    } else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") ||
               !strcmp(name, "OPTIMIZED")) {
        avio_skip(pb, size); // ignore
    } else
        return AVERROR_INVALIDDATA;

    return 0;
}

/**
 * Parse audio variable
 * @return < 0 if unknown
 */
static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
                           const char *name, int size)
{
    MvContext *mv = avctx->priv_data;
    AVIOContext *pb = avctx->pb;
    if (!strcmp(name, "__DIR_COUNT")) {
        st->nb_frames = var_read_int(pb, size);
    } else if (!strcmp(name, "AUDIO_FORMAT")) {
        mv->aformat = var_read_int(pb, size);
    } else if (!strcmp(name, "COMPRESSION")) {
        mv->acompression = var_read_int(pb, size);
    } else if (!strcmp(name, "DEFAULT_VOL")) {
        var_read_metadata(avctx, name, size);
    } else if (!strcmp(name, "NUM_CHANNELS")) {
        return set_channels(avctx, st, var_read_int(pb, size));
    } else if (!strcmp(name, "SAMPLE_RATE")) {
        int sample_rate = var_read_int(pb, size);
        if (sample_rate <= 0)
            return AVERROR_INVALIDDATA;
        st->codecpar->sample_rate = sample_rate;
        avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
    } else if (!strcmp(name, "SAMPLE_WIDTH")) {
        uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
        if (bpc > 16)
            return AVERROR_INVALIDDATA;
        st->codecpar->bits_per_coded_sample = bpc;
    } else
        return AVERROR_INVALIDDATA;

    return 0;
}

/**
 * Parse video variable
 * @return < 0 if unknown
 */
static int parse_video_var(AVFormatContext *avctx, AVStream *st,
                           const char *name, int size)
{
    AVIOContext *pb = avctx->pb;
    if (!strcmp(name, "__DIR_COUNT")) {
        st->nb_frames = st->duration = var_read_int(pb, size);
    } else if (!strcmp(name, "COMPRESSION")) {
        char *str = var_read_string(pb, size);
        if (!str)
            return AVERROR_INVALIDDATA;
        if (!strcmp(str, "1")) {
            st->codecpar->codec_id = AV_CODEC_ID_MVC1;
        } else if (!strcmp(str, "2")) {
            st->codecpar->format = AV_PIX_FMT_ABGR;
            st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
        } else if (!strcmp(str, "3")) {
            st->codecpar->codec_id = AV_CODEC_ID_SGIRLE;
        } else if (!strcmp(str, "10")) {
            st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
        } else if (!strcmp(str, "MVC2")) {
            st->codecpar->codec_id = AV_CODEC_ID_MVC2;
        } else {
            avpriv_request_sample(avctx, "Video compression %s", str);
        }
        av_free(str);
    } else if (!strcmp(name, "FPS")) {
        AVRational fps = var_read_float(pb, size);
        avpriv_set_pts_info(st, 64, fps.den, fps.num);
        st->avg_frame_rate = fps;
    } else if (!strcmp(name, "HEIGHT")) {
        st->codecpar->height = var_read_int(pb, size);
    } else if (!strcmp(name, "PIXEL_ASPECT")) {
        st->sample_aspect_ratio = var_read_float(pb, size);
        av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
                  st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
                  INT_MAX);
    } else if (!strcmp(name, "WIDTH")) {
        st->codecpar->width = var_read_int(pb, size);
    } else if (!strcmp(name, "ORIENTATION")) {
        if (var_read_int(pb, size) == 1101) {
            if (!st->codecpar->extradata) {
                st->codecpar->extradata = av_strdup("BottomUp");
                if (!st->codecpar->extradata)
                    return AVERROR(ENOMEM);
                st->codecpar->extradata_size = 9;
            }
        }
    } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
        var_read_metadata(avctx, name, size);
    } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
        avio_skip(pb, size); // ignore
    } else
        return AVERROR_INVALIDDATA;

    return 0;
}

static int read_table(AVFormatContext *avctx, AVStream *st,
                       int (*parse)(AVFormatContext *avctx, AVStream *st,
                                    const char *name, int size))
{
    unsigned count;
    int i;

    AVIOContext *pb = avctx->pb;
    avio_skip(pb, 4);
    count = avio_rb32(pb);
    avio_skip(pb, 4);
    for (i = 0; i < count; i++) {
        char name[17];
        int size;

        if (avio_feof(pb))
            return AVERROR_EOF;

        if (avio_read(pb, name, 16) != 16)
            return AVERROR_INVALIDDATA;
        name[sizeof(name) - 1] = 0;
        size = avio_rb32(pb);
        if (size < 0) {
            av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
            return AVERROR_INVALIDDATA;
        }
        if (parse(avctx, st, name, size) < 0) {
            avpriv_request_sample(avctx, "Variable %s", name);
            avio_skip(pb, size);
        }
    }
    return 0;
}

static void read_index(AVIOContext *pb, AVStream *st)
{
    uint64_t timestamp = 0;
    int i;
    for (i = 0; i < st->nb_frames; i++) {
        uint32_t pos  = avio_rb32(pb);
        uint32_t size = avio_rb32(pb);
        avio_skip(pb, 8);
        if (avio_feof(pb))
            return ;
        av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
        if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
            timestamp += size / (st->codecpar->ch_layout.nb_channels * 2LL);
        } else {
            timestamp++;
        }
    }
}

static int mv_read_header(AVFormatContext *avctx)
{
    MvContext *mv = avctx->priv_data;
    AVIOContext *pb = avctx->pb;
    AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
    int version, i;
    int ret;

    avio_skip(pb, 4);

    version = avio_rb16(pb);
    if (version == 2) {
        uint64_t timestamp;
        int v;
        uint32_t bytes_per_sample;
        AVRational fps;

        avio_skip(pb, 10);

        fps = av_d2q(av_int2double(avio_rb64(pb)), INT_MAX);

        /* allocate audio track first to prevent unnecessary seeking
         * (audio packet always precede video packet for a given frame) */
        v = avio_rb16(pb);
        if (v == MOVIE_SOUND) {
            /* movie has sound so allocate an audio stream */
            ast = avformat_new_stream(avctx, NULL);
            if (!ast)
                return AVERROR(ENOMEM);
        } else if (v != MOVIE_SILENT)
            return AVERROR_INVALIDDATA;

        avio_skip(pb, 2);

        vst = avformat_new_stream(avctx, NULL);
        if (!vst)
            return AVERROR(ENOMEM);
        avpriv_set_pts_info(vst, 64, fps.den, fps.num);
        vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
        vst->avg_frame_rate = fps;
        vst->duration = vst->nb_frames = avio_rb32(pb);
        v = avio_rb32(pb);
        switch (v) {
        case 1:
            vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
            break;
        case 2:
            vst->codecpar->format = AV_PIX_FMT_ARGB;
            vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
            break;
        default:
            avpriv_request_sample(avctx, "Video compression %i", v);
            break;
        }
        vst->codecpar->codec_tag = 0;
        vst->codecpar->width     = avio_rb32(pb);
        vst->codecpar->height    = avio_rb32(pb);
        avio_skip(pb, 12);

        if (ast) {
            ast->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
            ast->nb_frames = vst->nb_frames;
            ast->codecpar->sample_rate = avio_rb32(pb);
            if (ast->codecpar->sample_rate <= 0) {
                av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
                return AVERROR_INVALIDDATA;
            }
            avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);

            bytes_per_sample = avio_rb32(pb);

            v = avio_rb32(pb);
            if (v == AUDIO_FORMAT_SIGNED) {
                switch (bytes_per_sample) {
                case 1:
                    ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
                    break;
                case 2:
                    ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
                    break;
                default:
                    avpriv_request_sample(avctx, "Audio sample size %i bytes", bytes_per_sample);
                    break;
                }
            } else {
                avpriv_request_sample(avctx, "Audio compression (format %i)", v);
            }

            if (bytes_per_sample == 0)
                return AVERROR_INVALIDDATA;

            if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
                return AVERROR_INVALIDDATA;

            avio_skip(pb, 8);
        } else
            avio_skip(pb, 24); /* skip meaningless audio metadata */

        var_read_metadata(avctx, "title", 0x80);
        var_read_metadata(avctx, "comment", 0x100);
        avio_skip(pb, 0x80);

        timestamp = 0;
        for (i = 0; i < vst->nb_frames; i++) {
            uint32_t pos   = avio_rb32(pb);
            uint32_t asize = avio_rb32(pb);
            uint32_t vsize = avio_rb32(pb);
            if (avio_feof(pb))
                return AVERROR_INVALIDDATA;
            avio_skip(pb, 8);
            if (ast) {
                av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
                timestamp += asize / (ast->codecpar->ch_layout.nb_channels * (uint64_t)bytes_per_sample);
            }
            av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
        }
    } else if (!version && avio_rb16(pb) == 3) {
        avio_skip(pb, 4);

        if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
            return ret;

        if (mv->nb_audio_tracks < 0  || mv->nb_video_tracks < 0 ||
           (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
            av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
            return AVERROR_INVALIDDATA;
        }

        if (mv->nb_audio_tracks > 1) {
            avpriv_request_sample(avctx, "Multiple audio streams support");
            return AVERROR_PATCHWELCOME;
        } else if (mv->nb_audio_tracks) {
            ast = avformat_new_stream(avctx, NULL);
            if (!ast)
                return AVERROR(ENOMEM);
            ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
            if ((ret = read_table(avctx, ast, parse_audio_var)) < 0)
                return ret;
            if (mv->acompression == 100 &&
                mv->aformat == AUDIO_FORMAT_SIGNED &&
                ast->codecpar->bits_per_coded_sample == 16) {
                ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
            } else {
                avpriv_request_sample(avctx,
                                      "Audio compression %i (format %i, sr %i)",
                                      mv->acompression, mv->aformat,
                                      ast->codecpar->bits_per_coded_sample);
                ast->codecpar->codec_id = AV_CODEC_ID_NONE;
            }
            if (ast->codecpar->ch_layout.nb_channels <= 0) {
                av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
                return AVERROR_INVALIDDATA;
            }
        }

        if (mv->nb_video_tracks > 1) {
            avpriv_request_sample(avctx, "Multiple video streams support");
            return AVERROR_PATCHWELCOME;
        } else if (mv->nb_video_tracks) {
            vst = avformat_new_stream(avctx, NULL);
            if (!vst)
                return AVERROR(ENOMEM);
            vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
            if ((ret = read_table(avctx, vst, parse_video_var))<0)
                return ret;
        }

        if (mv->nb_audio_tracks)
            read_index(pb, ast);

        if (mv->nb_video_tracks)
            read_index(pb, vst);
    } else {
        avpriv_request_sample(avctx, "Version %i", version);
        return AVERROR_PATCHWELCOME;
    }

    return 0;
}

static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
    MvContext *mv = avctx->priv_data;
    AVIOContext *pb = avctx->pb;
    AVStream *st = avctx->streams[mv->stream_index];
    FFStream *const sti = ffstream(st);
    const AVIndexEntry *index;
    int frame = mv->frame[mv->stream_index];
    int64_t ret;
    uint64_t pos;

    if (frame < sti->nb_index_entries) {
        index = &sti->index_entries[frame];
        pos   = avio_tell(pb);
        if (index->pos > pos)
            avio_skip(pb, index->pos - pos);
        else if (index->pos < pos) {
            if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
                return AVERROR(ENOSYS);
            ret = avio_seek(pb, index->pos, SEEK_SET);
            if (ret < 0)
                return ret;
        }
        ret = av_get_packet(pb, pkt, index->size);
        if (ret < 0)
            return ret;

        pkt->stream_index = mv->stream_index;
        pkt->pts          = index->timestamp;
        pkt->flags       |= AV_PKT_FLAG_KEY;

        mv->frame[mv->stream_index]++;
        mv->eof_count = 0;
    } else {
        mv->eof_count++;
        if (mv->eof_count >= avctx->nb_streams)
            return AVERROR_EOF;

        // avoid returning 0 without a packet
        return AVERROR(EAGAIN);
    }

    mv->stream_index++;
    if (mv->stream_index >= avctx->nb_streams)
        mv->stream_index = 0;

    return 0;
}

static int mv_read_seek(AVFormatContext *avctx, int stream_index,
                        int64_t timestamp, int flags)
{
    MvContext *mv = avctx->priv_data;
    AVStream *st = avctx->streams[stream_index];
    int frame, i;

    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
        return AVERROR(ENOSYS);

    if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
        return AVERROR(ENOSYS);

    frame = av_index_search_timestamp(st, timestamp, flags);
    if (frame < 0)
        return AVERROR_INVALIDDATA;

    for (i = 0; i < avctx->nb_streams; i++)
        mv->frame[i] = frame;
    return 0;
}

const FFInputFormat ff_mv_demuxer = {
    .p.name         = "mv",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
    .priv_data_size = sizeof(MvContext),
    .read_probe     = mv_probe,
    .read_header    = mv_read_header,
    .read_packet    = mv_read_packet,
    .read_seek      = mv_read_seek,
};

Coverage Report

Created: 2026-10-28 08:13

Line	Count	Source
1		/*
2		* Silicon Graphics Movie demuxer
3		* Copyright (c) 2012 Peter Ross
4		*
5		* This file is part of FFmpeg.
6		*
7		* FFmpeg is free software; you can redistribute it and/or
8		* modify it under the terms of the GNU Lesser General Public
9		* License as published by the Free Software Foundation; either
10		* version 2.1 of the License, or (at your option) any later version.
11		*
12		* FFmpeg is distributed in the hope that it will be useful,
13		* but WITHOUT ANY WARRANTY; without even the implied warranty of
14		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15		* Lesser General Public License for more details.
16		*
17		* You should have received a copy of the GNU Lesser General Public
18		* License along with FFmpeg; if not, write to the Free Software
19		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20		*/
21
22		/**
23		* @file
24		* Silicon Graphics Movie demuxer
25		*/
26
27		#include "libavutil/channel_layout.h"
28		#include "libavutil/eval.h"
29		#include "libavutil/intfloat.h"
30		#include "libavutil/intreadwrite.h"
31		#include "libavutil/mem.h"
32		#include "libavutil/rational.h"
33
34		#include "avformat.h"
35		#include "demux.h"
36		#include "internal.h"
37
38		typedef struct MvContext {
39		int nb_video_tracks;
40		int nb_audio_tracks;
41
42		int eof_count; ///< number of streams that have finished
43		int stream_index; ///< current stream index
44		int frame[2]; ///< frame nb for current stream
45
46		int acompression; ///< compression level for audio stream
47		int aformat; ///< audio format
48		} MvContext;
49
50		/* these magic numbers are defined in moviefile.h on Silicon Graphics IRIX */
51	1.71k	#define MOVIE_SOUND 1
52	717	#define MOVIE_SILENT 2
53
54	1.94k	#define AUDIO_FORMAT_SIGNED 401
55
56		static int mv_probe(const AVProbeData *p)
57	963k	{
58	963k	if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
59	571	AV_RB16(p->buf + 4) < 3)
60	397	return AVPROBE_SCORE_MAX;
61	962k	return 0;
62	963k	}
63
64		static char var_read_string(AVIOContext pb, int size)
65	38.5k	{
66	38.5k	int n;
67	38.5k	char *str;
68
69	38.5k	if (size < 0 \|\| size == INT_MAX)
70	3.07k	return NULL;
71
72	35.4k	str = av_malloc(size + 1);
73	35.4k	if (!str)
74	0	return NULL;
75	35.4k	n = avio_get_str(pb, size, str, size + 1);
76	35.4k	if (n < size)
77	14.0k	avio_skip(pb, size - n);
78	35.4k	return str;
79	35.4k	}
80
81		static int var_read_int(AVIOContext *pb, int size)
82	17.7k	{
83	17.7k	int v;
84	17.7k	char *s = var_read_string(pb, size);
85	17.7k	if (!s)
86	1.29k	return 0;
87	16.4k	v = strtol(s, NULL, 10);
88	16.4k	av_free(s);
89	16.4k	return v;
90	17.7k	}
91
92		static AVRational var_read_float(AVIOContext *pb, int size)
93	9.80k	{
94	9.80k	AVRational v;
95	9.80k	char *s = var_read_string(pb, size);
96	9.80k	if (!s)
97	542	return (AVRational) { 0, 0 };
98	9.26k	v = av_d2q(av_strtod(s, NULL), INT_MAX);
99	9.26k	av_free(s);
100	9.26k	return v;
101	9.80k	}
102
103		static void var_read_metadata(AVFormatContext avctx, const char tag, int size)
104	8.20k	{
105	8.20k	char *value = var_read_string(avctx->pb, size);
106	8.20k	if (value)
107	7.20k	av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
108	8.20k	}
109
110		static int set_channels(AVFormatContext avctx, AVStream st, int channels)
111	2.62k	{
112	2.62k	if (channels <= 0) {
113	584	av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
114	584	return AVERROR_INVALIDDATA;
115	584	}
116	2.04k	av_channel_layout_default(&st->codecpar->ch_layout, channels);
117	2.04k	return 0;
118	2.62k	}
119
120		/**
121		* Parse global variable
122		* @return < 0 if unknown
123		*/
124		static int parse_global_var(AVFormatContext avctx, AVStream st,
125		const char *name, int size)
126	20.7k	{
127	20.7k	MvContext *mv = avctx->priv_data;
128	20.7k	AVIOContext *pb = avctx->pb;
129	20.7k	if (!strcmp(name, "__NUM_I_TRACKS")) {
130	3.00k	mv->nb_video_tracks = var_read_int(pb, size);
131	17.6k	} else if (!strcmp(name, "__NUM_A_TRACKS")) {
132	1.80k	mv->nb_audio_tracks = var_read_int(pb, size);
133	15.8k	} else if (!strcmp(name, "COMMENT") \|\| !strcmp(name, "TITLE")) {
134	2.29k	var_read_metadata(avctx, name, size);
135	13.5k	} else if (!strcmp(name, "LOOP_MODE") \|\| !strcmp(name, "NUM_LOOPS") \|\|
136	12.5k	!strcmp(name, "OPTIMIZED")) {
137	1.82k	avio_skip(pb, size); // ignore
138	1.82k	} else
139	11.7k	return AVERROR_INVALIDDATA;
140
141	8.93k	return 0;
142	20.7k	}
143
144		/**
145		* Parse audio variable
146		* @return < 0 if unknown
147		*/
148		static int parse_audio_var(AVFormatContext avctx, AVStream st,
149		const char *name, int size)
150	24.7k	{
151	24.7k	MvContext *mv = avctx->priv_data;
152	24.7k	AVIOContext *pb = avctx->pb;
153	24.7k	if (!strcmp(name, "__DIR_COUNT")) {
154	1.75k	st->nb_frames = var_read_int(pb, size);
155	22.9k	} else if (!strcmp(name, "AUDIO_FORMAT")) {
156	967	mv->aformat = var_read_int(pb, size);
157	21.9k	} else if (!strcmp(name, "COMPRESSION")) {
158	1.22k	mv->acompression = var_read_int(pb, size);
159	20.7k	} else if (!strcmp(name, "DEFAULT_VOL")) {
160	960	var_read_metadata(avctx, name, size);
161	19.8k	} else if (!strcmp(name, "NUM_CHANNELS")) {
162	1.67k	return set_channels(avctx, st, var_read_int(pb, size));
163	18.1k	} else if (!strcmp(name, "SAMPLE_RATE")) {
164	1.01k	int sample_rate = var_read_int(pb, size);
165	1.01k	if (sample_rate <= 0)
166	372	return AVERROR_INVALIDDATA;
167	646	st->codecpar->sample_rate = sample_rate;
168	646	avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
169	17.1k	} else if (!strcmp(name, "SAMPLE_WIDTH")) {
170	1.13k	uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
171	1.13k	if (bpc > 16)
172	569	return AVERROR_INVALIDDATA;
173	568	st->codecpar->bits_per_coded_sample = bpc;
174	568	} else
175	15.9k	return AVERROR_INVALIDDATA;
176
177	6.11k	return 0;
178	24.7k	}
179
180		/**
181		* Parse video variable
182		* @return < 0 if unknown
183		*/
184		static int parse_video_var(AVFormatContext avctx, AVStream st,
185		const char *name, int size)
186	84.9k	{
187	84.9k	AVIOContext *pb = avctx->pb;
188	84.9k	if (!strcmp(name, "__DIR_COUNT")) {
189	2.55k	st->nb_frames = st->duration = var_read_int(pb, size);
190	82.3k	} else if (!strcmp(name, "COMPRESSION")) {
191	2.79k	char *str = var_read_string(pb, size);
192	2.79k	if (!str)
193	240	return AVERROR_INVALIDDATA;
194	2.55k	if (!strcmp(str, "1")) {
195	280	st->codecpar->codec_id = AV_CODEC_ID_MVC1;
196	2.27k	} else if (!strcmp(str, "2")) {
197	315	st->codecpar->format = AV_PIX_FMT_ABGR;
198	315	st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
199	1.96k	} else if (!strcmp(str, "3")) {
200	201	st->codecpar->codec_id = AV_CODEC_ID_SGIRLE;
201	1.76k	} else if (!strcmp(str, "10")) {
202	212	st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
203	1.54k	} else if (!strcmp(str, "MVC2")) {
204	720	st->codecpar->codec_id = AV_CODEC_ID_MVC2;
205	829	} else {
206	829	avpriv_request_sample(avctx, "Video compression %s", str);
207	829	}
208	2.55k	av_free(str);
209	79.5k	} else if (!strcmp(name, "FPS")) {
210	7.97k	AVRational fps = var_read_float(pb, size);
211	7.97k	avpriv_set_pts_info(st, 64, fps.den, fps.num);
212	7.97k	st->avg_frame_rate = fps;
213	71.5k	} else if (!strcmp(name, "HEIGHT")) {
214	1.14k	st->codecpar->height = var_read_int(pb, size);
215	70.4k	} else if (!strcmp(name, "PIXEL_ASPECT")) {
216	1.83k	st->sample_aspect_ratio = var_read_float(pb, size);
217	1.83k	av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
218	1.83k	st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
219	1.83k	INT_MAX);
220	68.6k	} else if (!strcmp(name, "WIDTH")) {
221	404	st->codecpar->width = var_read_int(pb, size);
222	68.2k	} else if (!strcmp(name, "ORIENTATION")) {
223	1.08k	if (var_read_int(pb, size) == 1101) {
224	575	if (!st->codecpar->extradata) {
225	81	st->codecpar->extradata = av_strdup("BottomUp");
226	81	if (!st->codecpar->extradata)
227	0	return AVERROR(ENOMEM);
228	81	st->codecpar->extradata_size = 9;
229	81	}
230	575	}
231	67.1k	} else if (!strcmp(name, "Q_SPATIAL") \|\| !strcmp(name, "Q_TEMPORAL")) {
232	2.57k	var_read_metadata(avctx, name, size);
233	64.5k	} else if (!strcmp(name, "INTERLACING") \|\| !strcmp(name, "PACKING")) {
234	507	avio_skip(pb, size); // ignore
235	507	} else
236	64.0k	return AVERROR_INVALIDDATA;
237
238	20.6k	return 0;
239	84.9k	}
240
241		static int read_table(AVFormatContext avctx, AVStream st,
242		int (parse)(AVFormatContext avctx, AVStream *st,
243		const char *name, int size))
244	7.39k	{
245	7.39k	unsigned count;
246	7.39k	int i;
247
248	7.39k	AVIOContext *pb = avctx->pb;
249	7.39k	avio_skip(pb, 4);
250	7.39k	count = avio_rb32(pb);
251	7.39k	avio_skip(pb, 4);
252	137k	for (i = 0; i < count; i++) {
253	132k	char name[17];
254	132k	int size;
255
256	132k	if (avio_feof(pb))
257	1.38k	return AVERROR_EOF;
258
259	130k	if (avio_read(pb, name, 16) != 16)
260	257	return AVERROR_INVALIDDATA;
261	130k	name[sizeof(name) - 1] = 0;
262	130k	size = avio_rb32(pb);
263	130k	if (size < 0) {
264	82	av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
265	82	return AVERROR_INVALIDDATA;
266	82	}
267	130k	if (parse(avctx, st, name, size) < 0) {
268	93.5k	avpriv_request_sample(avctx, "Variable %s", name);
269	93.5k	avio_skip(pb, size);
270	93.5k	}
271	130k	}
272	5.67k	return 0;
273	7.39k	}
274
275		static void read_index(AVIOContext pb, AVStream st)
276	2.17k	{
277	2.17k	uint64_t timestamp = 0;
278	2.17k	int i;
279	1.81M	for (i = 0; i < st->nb_frames; i++) {
280	1.81M	uint32_t pos = avio_rb32(pb);
281	1.81M	uint32_t size = avio_rb32(pb);
282	1.81M	avio_skip(pb, 8);
283	1.81M	if (avio_feof(pb))
284	1.15k	return ;
285	1.81M	av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
286	1.81M	if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
287	43.8k	timestamp += size / (st->codecpar->ch_layout.nb_channels * 2LL);
288	1.77M	} else {
289	1.77M	timestamp++;
290	1.77M	}
291	1.81M	}
292	2.17k	}
293
294		static int mv_read_header(AVFormatContext *avctx)
295	5.74k	{
296	5.74k	MvContext *mv = avctx->priv_data;
297	5.74k	AVIOContext *pb = avctx->pb;
298	5.74k	AVStream ast = NULL, vst = NULL; //initialization to suppress warning
299	5.74k	int version, i;
300	5.74k	int ret;
301
302	5.74k	avio_skip(pb, 4);
303
304	5.74k	version = avio_rb16(pb);
305	5.74k	if (version == 2) {
306	1.71k	uint64_t timestamp;
307	1.71k	int v;
308	1.71k	uint32_t bytes_per_sample;
309	1.71k	AVRational fps;
310
311	1.71k	avio_skip(pb, 10);
312
313	1.71k	fps = av_d2q(av_int2double(avio_rb64(pb)), INT_MAX);
314
315		/* allocate audio track first to prevent unnecessary seeking
316		* (audio packet always precede video packet for a given frame) */
317	1.71k	v = avio_rb16(pb);
318	1.71k	if (v == MOVIE_SOUND) {
319		/* movie has sound so allocate an audio stream */
320	995	ast = avformat_new_stream(avctx, NULL);
321	995	if (!ast)
322	0	return AVERROR(ENOMEM);
323	995	} else if (v != MOVIE_SILENT)
324	407	return AVERROR_INVALIDDATA;
325
326	1.30k	avio_skip(pb, 2);
327
328	1.30k	vst = avformat_new_stream(avctx, NULL);
329	1.30k	if (!vst)
330	0	return AVERROR(ENOMEM);
331	1.30k	avpriv_set_pts_info(vst, 64, fps.den, fps.num);
332	1.30k	vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
333	1.30k	vst->avg_frame_rate = fps;
334	1.30k	vst->duration = vst->nb_frames = avio_rb32(pb);
335	1.30k	v = avio_rb32(pb);
336	1.30k	switch (v) {
337	68	case 1:
338	68	vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
339	68	break;
340	136	case 2:
341	136	vst->codecpar->format = AV_PIX_FMT_ARGB;
342	136	vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
343	136	break;
344	1.10k	default:
345	1.10k	avpriv_request_sample(avctx, "Video compression %i", v);
346	1.10k	break;
347	1.30k	}
348	1.30k	vst->codecpar->codec_tag = 0;
349	1.30k	vst->codecpar->width = avio_rb32(pb);
350	1.30k	vst->codecpar->height = avio_rb32(pb);
351	1.30k	avio_skip(pb, 12);
352
353	1.30k	if (ast) {
354	995	ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
355	995	ast->nb_frames = vst->nb_frames;
356	995	ast->codecpar->sample_rate = avio_rb32(pb);
357	995	if (ast->codecpar->sample_rate <= 0) {
358	42	av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
359	42	return AVERROR_INVALIDDATA;
360	42	}
361	953	avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
362
363	953	bytes_per_sample = avio_rb32(pb);
364
365	953	v = avio_rb32(pb);
366	953	if (v == AUDIO_FORMAT_SIGNED) {
367	543	switch (bytes_per_sample) {
368	525	case 1:
369	525	ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
370	525	break;
371	8	case 2:
372	8	ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
373	8	break;
374	10	default:
375	10	avpriv_request_sample(avctx, "Audio sample size %i bytes", bytes_per_sample);
376	10	break;
377	543	}
378	543	} else {
379	410	avpriv_request_sample(avctx, "Audio compression (format %i)", v);
380	410	}
381
382	953	if (bytes_per_sample == 0)
383	3	return AVERROR_INVALIDDATA;
384
385	950	if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
386	72	return AVERROR_INVALIDDATA;
387
388	878	avio_skip(pb, 8);
389	878	} else
390	310	avio_skip(pb, 24); /* skip meaningless audio metadata */
391
392	1.18k	var_read_metadata(avctx, "title", 0x80);
393	1.18k	var_read_metadata(avctx, "comment", 0x100);
394	1.18k	avio_skip(pb, 0x80);
395
396	1.18k	timestamp = 0;
397	1.16M	for (i = 0; i < vst->nb_frames; i++) {
398	1.16M	uint32_t pos = avio_rb32(pb);
399	1.16M	uint32_t asize = avio_rb32(pb);
400	1.16M	uint32_t vsize = avio_rb32(pb);
401	1.16M	if (avio_feof(pb))
402	121	return AVERROR_INVALIDDATA;
403	1.16M	avio_skip(pb, 8);
404	1.16M	if (ast) {
405	1.16M	av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
406	1.16M	timestamp += asize / (ast->codecpar->ch_layout.nb_channels * (uint64_t)bytes_per_sample);
407	1.16M	}
408	1.16M	av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
409	1.16M	}
410	4.03k	} else if (!version && avio_rb16(pb) == 3) {
411	3.90k	avio_skip(pb, 4);
412
413	3.90k	if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
414	516	return ret;
415
416	3.38k	if (mv->nb_audio_tracks < 0 \|\| mv->nb_video_tracks < 0 \|\|
417	3.36k	(mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
418	106	av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
419	106	return AVERROR_INVALIDDATA;
420	106	}
421
422	3.28k	if (mv->nb_audio_tracks > 1) {
423	34	avpriv_request_sample(avctx, "Multiple audio streams support");
424	34	return AVERROR_PATCHWELCOME;
425	3.24k	} else if (mv->nb_audio_tracks) {
426	1.22k	ast = avformat_new_stream(avctx, NULL);
427	1.22k	if (!ast)
428	0	return AVERROR(ENOMEM);
429	1.22k	ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
430	1.22k	if ((ret = read_table(avctx, ast, parse_audio_var)) < 0)
431	458	return ret;
432	767	if (mv->acompression == 100 &&
433	226	mv->aformat == AUDIO_FORMAT_SIGNED &&
434	178	ast->codecpar->bits_per_coded_sample == 16) {
435	158	ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
436	609	} else {
437	609	avpriv_request_sample(avctx,
438	609	"Audio compression %i (format %i, sr %i)",
439	609	mv->acompression, mv->aformat,
440	609	ast->codecpar->bits_per_coded_sample);
441	609	ast->codecpar->codec_id = AV_CODEC_ID_NONE;
442	609	}
443	767	if (ast->codecpar->ch_layout.nb_channels <= 0) {
444	76	av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
445	76	return AVERROR_INVALIDDATA;
446	76	}
447	767	}
448
449	2.71k	if (mv->nb_video_tracks > 1) {
450	34	avpriv_request_sample(avctx, "Multiple video streams support");
451	34	return AVERROR_PATCHWELCOME;
452	2.68k	} else if (mv->nb_video_tracks) {
453	2.26k	vst = avformat_new_stream(avctx, NULL);
454	2.26k	if (!vst)
455	0	return AVERROR(ENOMEM);
456	2.26k	vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
457	2.26k	if ((ret = read_table(avctx, vst, parse_video_var))<0)
458	745	return ret;
459	2.26k	}
460
461	1.93k	if (mv->nb_audio_tracks)
462	657	read_index(pb, ast);
463
464	1.93k	if (mv->nb_video_tracks)
465	1.52k	read_index(pb, vst);
466	1.93k	} else {
467	126	avpriv_request_sample(avctx, "Version %i", version);
468	126	return AVERROR_PATCHWELCOME;
469	126	}
470
471	3.00k	return 0;
472	5.74k	}
473
474		static int mv_read_packet(AVFormatContext avctx, AVPacket pkt)
475	399k	{
476	399k	MvContext *mv = avctx->priv_data;
477	399k	AVIOContext *pb = avctx->pb;
478	399k	AVStream *st = avctx->streams[mv->stream_index];
479	399k	FFStream *const sti = ffstream(st);
480	399k	const AVIndexEntry *index;
481	399k	int frame = mv->frame[mv->stream_index];
482	399k	int64_t ret;
483	399k	uint64_t pos;
484
485	399k	if (frame < sti->nb_index_entries) {
486	396k	index = &sti->index_entries[frame];
487	396k	pos = avio_tell(pb);
488	396k	if (index->pos > pos)
489	14.3k	avio_skip(pb, index->pos - pos);
490	381k	else if (index->pos < pos) {
491	11.9k	if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
492	342	return AVERROR(ENOSYS);
493	11.6k	ret = avio_seek(pb, index->pos, SEEK_SET);
494	11.6k	if (ret < 0)
495	19	return ret;
496	11.6k	}
497	395k	ret = av_get_packet(pb, pkt, index->size);
498	395k	if (ret < 0)
499	1.99k	return ret;
500
501	393k	pkt->stream_index = mv->stream_index;
502	393k	pkt->pts = index->timestamp;
503	393k	pkt->flags \|= AV_PKT_FLAG_KEY;
504
505	393k	mv->frame[mv->stream_index]++;
506	393k	mv->eof_count = 0;
507	393k	} else {
508	3.62k	mv->eof_count++;
509	3.62k	if (mv->eof_count >= avctx->nb_streams)
510	3.18k	return AVERROR_EOF;
511
512		// avoid returning 0 without a packet
513	438	return AVERROR(EAGAIN);
514	3.62k	}
515
516	393k	mv->stream_index++;
517	393k	if (mv->stream_index >= avctx->nb_streams)
518	386k	mv->stream_index = 0;
519
520	393k	return 0;
521	399k	}
522
523		static int mv_read_seek(AVFormatContext *avctx, int stream_index,
524		int64_t timestamp, int flags)
525	0	{
526	0	MvContext *mv = avctx->priv_data;
527	0	AVStream *st = avctx->streams[stream_index];
528	0	int frame, i;
529
530	0	if ((flags & AVSEEK_FLAG_FRAME) \|\| (flags & AVSEEK_FLAG_BYTE))
531	0	return AVERROR(ENOSYS);
532
533	0	if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
534	0	return AVERROR(ENOSYS);
535
536	0	frame = av_index_search_timestamp(st, timestamp, flags);
537	0	if (frame < 0)
538	0	return AVERROR_INVALIDDATA;
539
540	0	for (i = 0; i < avctx->nb_streams; i++)
541	0	mv->frame[i] = frame;
542	0	return 0;
543	0	}
544
545		const FFInputFormat ff_mv_demuxer = {
546		.p.name = "mv",
547		.p.long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
548		.priv_data_size = sizeof(MvContext),
549		.read_probe = mv_probe,
550		.read_header = mv_read_header,
551		.read_packet = mv_read_packet,
552		.read_seek = mv_read_seek,
553		};