[deb_ffmpeg.git] / ffmpeg / libavformat / smjpegdec.c

/*
 * SMJPEG demuxer
 * Copyright (c) 2011 Paul B Mahol
 *
 * 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
 * This is a demuxer for Loki SDL Motion JPEG files
 */

#include <inttypes.h>

#include "avformat.h"
#include "internal.h"
#include "riff.h"
#include "smjpeg.h"

typedef struct SMJPEGContext {
    int audio_stream_index;
    int video_stream_index;
} SMJPEGContext;

static int smjpeg_probe(AVProbeData *p)
{
    if (!memcmp(p->buf, SMJPEG_MAGIC, 8))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int smjpeg_read_header(AVFormatContext *s)
{
    SMJPEGContext *sc = s->priv_data;
    AVStream *ast = NULL, *vst = NULL;
    AVIOContext *pb = s->pb;
    uint32_t version, htype, hlength, duration;
    char *comment;

    avio_skip(pb, 8); // magic
    version = avio_rb32(pb);
    if (version)
        avpriv_request_sample(s, "Unknown version %"PRIu32, version);

    duration = avio_rb32(pb); // in msec

    while (!avio_feof(pb)) {
        htype = avio_rl32(pb);
        switch (htype) {
        case SMJPEG_TXT:
            hlength = avio_rb32(pb);
            if (!hlength || hlength > 512)
                return AVERROR_INVALIDDATA;
            comment = av_malloc(hlength + 1);
            if (!comment)
                return AVERROR(ENOMEM);
            if (avio_read(pb, comment, hlength) != hlength) {
                av_freep(&comment);
                av_log(s, AV_LOG_ERROR, "error when reading comment\n");
                return AVERROR_INVALIDDATA;
            }
            comment[hlength] = 0;
            av_dict_set(&s->metadata, "comment", comment,
                        AV_DICT_DONT_STRDUP_VAL);
            break;
        case SMJPEG_SND:
            if (ast) {
                avpriv_request_sample(s, "Multiple audio streams");
                return AVERROR_PATCHWELCOME;
            }
            hlength = avio_rb32(pb);
            if (hlength < 8)
                return AVERROR_INVALIDDATA;
            ast = avformat_new_stream(s, 0);
            if (!ast)
                return AVERROR(ENOMEM);
            ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
            ast->codec->sample_rate = avio_rb16(pb);
            ast->codec->bits_per_coded_sample = avio_r8(pb);
            ast->codec->channels    = avio_r8(pb);
            ast->codec->codec_tag   = avio_rl32(pb);
            ast->codec->codec_id    = ff_codec_get_id(ff_codec_smjpeg_audio_tags,
                                                      ast->codec->codec_tag);
            ast->duration           = duration;
            sc->audio_stream_index  = ast->index;
            avpriv_set_pts_info(ast, 32, 1, 1000);
            avio_skip(pb, hlength - 8);
            break;
        case SMJPEG_VID:
            if (vst) {
                avpriv_request_sample(s, "Multiple video streams");
                return AVERROR_INVALIDDATA;
            }
            hlength = avio_rb32(pb);
            if (hlength < 12)
                return AVERROR_INVALIDDATA;
            vst = avformat_new_stream(s, 0);
            if (!vst)
                return AVERROR(ENOMEM);
            vst->nb_frames         = avio_rb32(pb);
            vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
            vst->codec->width      = avio_rb16(pb);
            vst->codec->height     = avio_rb16(pb);
            vst->codec->codec_tag  = avio_rl32(pb);
            vst->codec->codec_id   = ff_codec_get_id(ff_codec_smjpeg_video_tags,
                                                     vst->codec->codec_tag);
            vst->duration          = duration;
            sc->video_stream_index = vst->index;
            avpriv_set_pts_info(vst, 32, 1, 1000);
            avio_skip(pb, hlength - 12);
            break;
        case SMJPEG_HEND:
            return 0;
        default:
            av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype);
            return AVERROR_INVALIDDATA;
        }
    }

    return AVERROR_EOF;
}

static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    SMJPEGContext *sc = s->priv_data;
    uint32_t dtype, size, timestamp;
    int64_t pos;
    int ret;

    if (avio_feof(s->pb))
        return AVERROR_EOF;
    pos   = avio_tell(s->pb);
    dtype = avio_rl32(s->pb);
    switch (dtype) {
    case SMJPEG_SNDD:
        timestamp = avio_rb32(s->pb);
        size = avio_rb32(s->pb);
        ret = av_get_packet(s->pb, pkt, size);
        pkt->stream_index = sc->audio_stream_index;
        pkt->pts = timestamp;
        pkt->pos = pos;
        break;
    case SMJPEG_VIDD:
        timestamp = avio_rb32(s->pb);
        size = avio_rb32(s->pb);
        ret = av_get_packet(s->pb, pkt, size);
        pkt->stream_index = sc->video_stream_index;
        pkt->pts = timestamp;
        pkt->pos = pos;
        break;
    case SMJPEG_DONE:
        ret = AVERROR_EOF;
        break;
    default:
        av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype);
        ret = AVERROR_INVALIDDATA;
        break;
    }
    return ret;
}

AVInputFormat ff_smjpeg_demuxer = {
    .name           = "smjpeg",
    .long_name      = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
    .priv_data_size = sizeof(SMJPEGContext),
    .read_probe     = smjpeg_probe,
    .read_header    = smjpeg_read_header,
    .read_packet    = smjpeg_read_packet,
    .extensions     = "mjpg",
    .flags          = AVFMT_GENERIC_INDEX,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* SMJPEG demuxer
	3	* Copyright (c) 2011 Paul B Mahol
	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	* This is a demuxer for Loki SDL Motion JPEG files
	25	*/
	26
	27	#include <inttypes.h>
	28
	29	#include "avformat.h"
	30	#include "internal.h"
	31	#include "riff.h"
	32	#include "smjpeg.h"
	33
	34	typedef struct SMJPEGContext {
	35	int audio_stream_index;
	36	int video_stream_index;
	37	} SMJPEGContext;
	38
	39	static int smjpeg_probe(AVProbeData *p)
	40	{
	41	if (!memcmp(p->buf, SMJPEG_MAGIC, 8))
	42	return AVPROBE_SCORE_MAX;
	43	return 0;
	44	}
	45
	46	static int smjpeg_read_header(AVFormatContext *s)
	47	{
	48	SMJPEGContext *sc = s->priv_data;
	49	AVStream ast = NULL, vst = NULL;
	50	AVIOContext *pb = s->pb;
	51	uint32_t version, htype, hlength, duration;
	52	char *comment;
	53
	54	avio_skip(pb, 8); // magic
	55	version = avio_rb32(pb);
	56	if (version)
	57	avpriv_request_sample(s, "Unknown version %"PRIu32, version);
	58
	59	duration = avio_rb32(pb); // in msec
	60
	61	while (!avio_feof(pb)) {
	62	htype = avio_rl32(pb);
	63	switch (htype) {
	64	case SMJPEG_TXT:
65	hlength = avio_rb32(pb);
66	if (!hlength \|\| hlength > 512)
67	return AVERROR_INVALIDDATA;
68	comment = av_malloc(hlength + 1);
69	if (!comment)
70	return AVERROR(ENOMEM);
71	if (avio_read(pb, comment, hlength) != hlength) {
72	av_freep(&comment);
73	av_log(s, AV_LOG_ERROR, "error when reading comment\n");
74	return AVERROR_INVALIDDATA;
75	}
76	comment[hlength] = 0;
77	av_dict_set(&s->metadata, "comment", comment,
78	AV_DICT_DONT_STRDUP_VAL);
79	break;
80	case SMJPEG_SND:
81	if (ast) {
82	avpriv_request_sample(s, "Multiple audio streams");
83	return AVERROR_PATCHWELCOME;
84	}
85	hlength = avio_rb32(pb);
86	if (hlength < 8)
87	return AVERROR_INVALIDDATA;
88	ast = avformat_new_stream(s, 0);
89	if (!ast)
90	return AVERROR(ENOMEM);
91	ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
92	ast->codec->sample_rate = avio_rb16(pb);
93	ast->codec->bits_per_coded_sample = avio_r8(pb);
94	ast->codec->channels = avio_r8(pb);
95	ast->codec->codec_tag = avio_rl32(pb);
96	ast->codec->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags,
97	ast->codec->codec_tag);
98	ast->duration = duration;
99	sc->audio_stream_index = ast->index;
100	avpriv_set_pts_info(ast, 32, 1, 1000);
101	avio_skip(pb, hlength - 8);
102	break;
103	case SMJPEG_VID:
104	if (vst) {
105	avpriv_request_sample(s, "Multiple video streams");
106	return AVERROR_INVALIDDATA;
107	}
108	hlength = avio_rb32(pb);
109	if (hlength < 12)
110	return AVERROR_INVALIDDATA;
111	vst = avformat_new_stream(s, 0);
112	if (!vst)
113	return AVERROR(ENOMEM);
114	vst->nb_frames = avio_rb32(pb);
115	vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
116	vst->codec->width = avio_rb16(pb);
117	vst->codec->height = avio_rb16(pb);
118	vst->codec->codec_tag = avio_rl32(pb);
119	vst->codec->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags,
120	vst->codec->codec_tag);
121	vst->duration = duration;
122	sc->video_stream_index = vst->index;
123	avpriv_set_pts_info(vst, 32, 1, 1000);
124	avio_skip(pb, hlength - 12);
125	break;
126	case SMJPEG_HEND:
127	return 0;
128	default:
129	av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype);
130	return AVERROR_INVALIDDATA;
131	}
132	}
133
134	return AVERROR_EOF;
135	}
136
137	static int smjpeg_read_packet(AVFormatContext s, AVPacket pkt)
138	{
139	SMJPEGContext *sc = s->priv_data;
140	uint32_t dtype, size, timestamp;
141	int64_t pos;
142	int ret;
143
144	if (avio_feof(s->pb))
145	return AVERROR_EOF;
146	pos = avio_tell(s->pb);
147	dtype = avio_rl32(s->pb);
148	switch (dtype) {
149	case SMJPEG_SNDD:
150	timestamp = avio_rb32(s->pb);
151	size = avio_rb32(s->pb);
152	ret = av_get_packet(s->pb, pkt, size);
153	pkt->stream_index = sc->audio_stream_index;
154	pkt->pts = timestamp;
155	pkt->pos = pos;
156	break;
157	case SMJPEG_VIDD:
158	timestamp = avio_rb32(s->pb);
159	size = avio_rb32(s->pb);
160	ret = av_get_packet(s->pb, pkt, size);
161	pkt->stream_index = sc->video_stream_index;
162	pkt->pts = timestamp;
163	pkt->pos = pos;
164	break;
165	case SMJPEG_DONE:
166	ret = AVERROR_EOF;
167	break;
168	default:
169	av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype);
170	ret = AVERROR_INVALIDDATA;
171	break;
172	}
173	return ret;
174	}
175
176	AVInputFormat ff_smjpeg_demuxer = {
177	.name = "smjpeg",
178	.long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
179	.priv_data_size = sizeof(SMJPEGContext),
180	.read_probe = smjpeg_probe,
181	.read_header = smjpeg_read_header,
182	.read_packet = smjpeg_read_packet,
183	.extensions = "mjpg",
184	.flags = AVFMT_GENERIC_INDEX,
185	};