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

/*
 * AVS demuxer.
 * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
 * 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
 */

#include "avformat.h"
#include "voc.h"


typedef struct avs_format {
    VocDecContext voc;
    AVStream *st_video;
    AVStream *st_audio;
    int width;
    int height;
    int bits_per_sample;
    int fps;
    int nb_frames;
    int remaining_frame_size;
    int remaining_audio_size;
} AvsFormat;

typedef enum avs_block_type {
    AVS_NONE      = 0x00,
    AVS_VIDEO     = 0x01,
    AVS_AUDIO     = 0x02,
    AVS_PALETTE   = 0x03,
    AVS_GAME_DATA = 0x04,
} AvsBlockType;

static int avs_probe(AVProbeData * p)
{
    const uint8_t *d;

    d = p->buf;
    if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
        /* Ensure the buffer probe scores higher than the extension probe.
         * This avoids problems with misdetection as AviSynth scripts. */
        return AVPROBE_SCORE_EXTENSION + 5;

    return 0;
}

static int avs_read_header(AVFormatContext * s)
{
    AvsFormat *avs = s->priv_data;

    s->ctx_flags |= AVFMTCTX_NOHEADER;

    avio_skip(s->pb, 4);
    avs->width = avio_rl16(s->pb);
    avs->height = avio_rl16(s->pb);
    avs->bits_per_sample = avio_rl16(s->pb);
    avs->fps = avio_rl16(s->pb);
    avs->nb_frames = avio_rl32(s->pb);
    avs->remaining_frame_size = 0;
    avs->remaining_audio_size = 0;

    avs->st_video = avs->st_audio = NULL;

    if (avs->width != 318 || avs->height != 198)
        av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
               "when the avs format is supposed to be 318x198 only.\n",
               avs->width, avs->height);

    return 0;
}

static int
avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
                      AvsBlockType type, int sub_type, int size,
                      uint8_t * palette, int palette_size)
{
    AvsFormat *avs = s->priv_data;
    int ret;

    ret = av_new_packet(pkt, size + palette_size);
    if (ret < 0)
        return ret;

    if (palette_size) {
        pkt->data[0] = 0x00;
        pkt->data[1] = 0x03;
        pkt->data[2] = palette_size & 0xFF;
        pkt->data[3] = (palette_size >> 8) & 0xFF;
        memcpy(pkt->data + 4, palette, palette_size - 4);
    }

    pkt->data[palette_size + 0] = sub_type;
    pkt->data[palette_size + 1] = type;
    pkt->data[palette_size + 2] = size & 0xFF;
    pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
    ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
    if (ret < size) {
        av_free_packet(pkt);
        return AVERROR(EIO);
    }

    pkt->size = ret + palette_size;
    pkt->stream_index = avs->st_video->index;
    if (sub_type == 0)
        pkt->flags |= AV_PKT_FLAG_KEY;

    return 0;
}

static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
{
    AvsFormat *avs = s->priv_data;
    int ret, size;

    size = avio_tell(s->pb);
    ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
    size = avio_tell(s->pb) - size;
    avs->remaining_audio_size -= size;

    if (ret == AVERROR(EIO))
        return 0;    /* this indicate EOS */
    if (ret < 0)
        return ret;

    pkt->stream_index = avs->st_audio->index;
    pkt->flags |= AV_PKT_FLAG_KEY;

    return size;
}

static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
{
    AvsFormat *avs = s->priv_data;
    int sub_type = 0, size = 0;
    AvsBlockType type = AVS_NONE;
    int palette_size = 0;
    uint8_t palette[4 + 3 * 256];
    int ret;

    if (avs->remaining_audio_size > 0)
        if (avs_read_audio_packet(s, pkt) > 0)
            return 0;

    while (1) {
        if (avs->remaining_frame_size <= 0) {
            if (!avio_rl16(s->pb))    /* found EOF */
                return AVERROR(EIO);
            avs->remaining_frame_size = avio_rl16(s->pb) - 4;
        }

        while (avs->remaining_frame_size > 0) {
            sub_type = avio_r8(s->pb);
            type = avio_r8(s->pb);
            size = avio_rl16(s->pb);
            if (size < 4)
                return AVERROR_INVALIDDATA;
            avs->remaining_frame_size -= size;

            switch (type) {
            case AVS_PALETTE:
                if (size - 4 > sizeof(palette))
                    return AVERROR_INVALIDDATA;
                ret = avio_read(s->pb, palette, size - 4);
                if (ret < size - 4)
                    return AVERROR(EIO);
                palette_size = size;
                break;

            case AVS_VIDEO:
                if (!avs->st_video) {
                    avs->st_video = avformat_new_stream(s, NULL);
                    if (!avs->st_video)
                        return AVERROR(ENOMEM);
                    avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;
                    avs->st_video->codec->codec_id = AV_CODEC_ID_AVS;
                    avs->st_video->codec->width = avs->width;
                    avs->st_video->codec->height = avs->height;
                    avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample;
                    avs->st_video->nb_frames = avs->nb_frames;
#if FF_API_R_FRAME_RATE
                    avs->st_video->r_frame_rate =
#endif
                    avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
                }
                return avs_read_video_packet(s, pkt, type, sub_type, size,
                                             palette, palette_size);

            case AVS_AUDIO:
                if (!avs->st_audio) {
                    avs->st_audio = avformat_new_stream(s, NULL);
                    if (!avs->st_audio)
                        return AVERROR(ENOMEM);
                    avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
                }
                avs->remaining_audio_size = size - 4;
                size = avs_read_audio_packet(s, pkt);
                if (size != 0)
                    return size;
                break;

            default:
                avio_skip(s->pb, size - 4);
            }
        }
    }
}

static int avs_read_close(AVFormatContext * s)
{
    return 0;
}

AVInputFormat ff_avs_demuxer = {
    .name           = "avs",
    .long_name      = NULL_IF_CONFIG_SMALL("AVS"),
    .priv_data_size = sizeof(AvsFormat),
    .read_probe     = avs_probe,
    .read_header    = avs_read_header,
    .read_packet    = avs_read_packet,
    .read_close     = avs_read_close,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* AVS demuxer.
	3	* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
	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	#include "avformat.h"
	23	#include "voc.h"
	24
	25
	26	typedef struct avs_format {
	27	VocDecContext voc;
	28	AVStream *st_video;
	29	AVStream *st_audio;
	30	int width;
	31	int height;
	32	int bits_per_sample;
	33	int fps;
	34	int nb_frames;
	35	int remaining_frame_size;
	36	int remaining_audio_size;
	37	} AvsFormat;
	38
	39	typedef enum avs_block_type {
	40	AVS_NONE = 0x00,
	41	AVS_VIDEO = 0x01,
	42	AVS_AUDIO = 0x02,
	43	AVS_PALETTE = 0x03,
	44	AVS_GAME_DATA = 0x04,
	45	} AvsBlockType;
	46
	47	static int avs_probe(AVProbeData * p)
	48	{
	49	const uint8_t *d;
	50
	51	d = p->buf;
	52	if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
	53	/* Ensure the buffer probe scores higher than the extension probe.
	54	* This avoids problems with misdetection as AviSynth scripts. */
	55	return AVPROBE_SCORE_EXTENSION + 5;
	56
	57	return 0;
	58	}
	59
	60	static int avs_read_header(AVFormatContext * s)
	61	{
	62	AvsFormat *avs = s->priv_data;
	63
	64	s->ctx_flags \|= AVFMTCTX_NOHEADER;
65
66	avio_skip(s->pb, 4);
67	avs->width = avio_rl16(s->pb);
68	avs->height = avio_rl16(s->pb);
69	avs->bits_per_sample = avio_rl16(s->pb);
70	avs->fps = avio_rl16(s->pb);
71	avs->nb_frames = avio_rl32(s->pb);
72	avs->remaining_frame_size = 0;
73	avs->remaining_audio_size = 0;
74
75	avs->st_video = avs->st_audio = NULL;
76
77	if (avs->width != 318 \|\| avs->height != 198)
78	av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
79	"when the avs format is supposed to be 318x198 only.\n",
80	avs->width, avs->height);
81
82	return 0;
83	}
84
85	static int
86	avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
87	AvsBlockType type, int sub_type, int size,
88	uint8_t * palette, int palette_size)
89	{
90	AvsFormat *avs = s->priv_data;
91	int ret;
92
93	ret = av_new_packet(pkt, size + palette_size);
94	if (ret < 0)
95	return ret;
96
97	if (palette_size) {
98	pkt->data[0] = 0x00;
99	pkt->data[1] = 0x03;
100	pkt->data[2] = palette_size & 0xFF;
101	pkt->data[3] = (palette_size >> 8) & 0xFF;
102	memcpy(pkt->data + 4, palette, palette_size - 4);
103	}
104
105	pkt->data[palette_size + 0] = sub_type;
106	pkt->data[palette_size + 1] = type;
107	pkt->data[palette_size + 2] = size & 0xFF;
108	pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
109	ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
110	if (ret < size) {
111	av_free_packet(pkt);
112	return AVERROR(EIO);
113	}
114
115	pkt->size = ret + palette_size;
116	pkt->stream_index = avs->st_video->index;
117	if (sub_type == 0)
118	pkt->flags \|= AV_PKT_FLAG_KEY;
119
120	return 0;
121	}
122
123	static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
124	{
125	AvsFormat *avs = s->priv_data;
126	int ret, size;
127
128	size = avio_tell(s->pb);
129	ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
130	size = avio_tell(s->pb) - size;
131	avs->remaining_audio_size -= size;
132
133	if (ret == AVERROR(EIO))
134	return 0; /* this indicate EOS */
135	if (ret < 0)
136	return ret;
137
138	pkt->stream_index = avs->st_audio->index;
139	pkt->flags \|= AV_PKT_FLAG_KEY;
140
141	return size;
142	}
143
144	static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
145	{
146	AvsFormat *avs = s->priv_data;
147	int sub_type = 0, size = 0;
148	AvsBlockType type = AVS_NONE;
149	int palette_size = 0;
150	uint8_t palette[4 + 3 * 256];
151	int ret;
152
153	if (avs->remaining_audio_size > 0)
154	if (avs_read_audio_packet(s, pkt) > 0)
155	return 0;
156
157	while (1) {
158	if (avs->remaining_frame_size <= 0) {
159	if (!avio_rl16(s->pb)) /* found EOF */
160	return AVERROR(EIO);
161	avs->remaining_frame_size = avio_rl16(s->pb) - 4;
162	}
163
164	while (avs->remaining_frame_size > 0) {
165	sub_type = avio_r8(s->pb);
166	type = avio_r8(s->pb);
167	size = avio_rl16(s->pb);
168	if (size < 4)
169	return AVERROR_INVALIDDATA;
170	avs->remaining_frame_size -= size;
171
172	switch (type) {
173	case AVS_PALETTE:
174	if (size - 4 > sizeof(palette))
175	return AVERROR_INVALIDDATA;
176	ret = avio_read(s->pb, palette, size - 4);
177	if (ret < size - 4)
178	return AVERROR(EIO);
179	palette_size = size;
180	break;
181
182	case AVS_VIDEO:
183	if (!avs->st_video) {
184	avs->st_video = avformat_new_stream(s, NULL);
185	if (!avs->st_video)
186	return AVERROR(ENOMEM);
187	avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;
188	avs->st_video->codec->codec_id = AV_CODEC_ID_AVS;
189	avs->st_video->codec->width = avs->width;
190	avs->st_video->codec->height = avs->height;
191	avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample;
192	avs->st_video->nb_frames = avs->nb_frames;
193	#if FF_API_R_FRAME_RATE
194	avs->st_video->r_frame_rate =
195	#endif
196	avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
197	}
198	return avs_read_video_packet(s, pkt, type, sub_type, size,
199	palette, palette_size);
200
201	case AVS_AUDIO:
202	if (!avs->st_audio) {
203	avs->st_audio = avformat_new_stream(s, NULL);
204	if (!avs->st_audio)
205	return AVERROR(ENOMEM);
206	avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
207	}
208	avs->remaining_audio_size = size - 4;
209	size = avs_read_audio_packet(s, pkt);
210	if (size != 0)
211	return size;
212	break;
213
214	default:
215	avio_skip(s->pb, size - 4);
216	}
217	}
218	}
219	}
220
221	static int avs_read_close(AVFormatContext * s)
222	{
223	return 0;
224	}
225
226	AVInputFormat ff_avs_demuxer = {
227	.name = "avs",
228	.long_name = NULL_IF_CONFIG_SMALL("AVS"),
229	.priv_data_size = sizeof(AvsFormat),
230	.read_probe = avs_probe,
231	.read_header = avs_read_header,
232	.read_packet = avs_read_packet,
233	.read_close = avs_read_close,
234	};