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

/*
 * Musepack demuxer
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * 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 "libavutil/channel_layout.h"
#include "libavcodec/get_bits.h"
#include "avformat.h"
#include "internal.h"
#include "apetag.h"
#include "id3v1.h"
#include "libavutil/dict.h"

#define MPC_FRAMESIZE  1152
#define DELAY_FRAMES   32

static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
typedef struct {
    int64_t pos;
    int size, skip;
}MPCFrame;

typedef struct {
    int ver;
    uint32_t curframe, lastframe;
    uint32_t fcount;
    MPCFrame *frames;
    int curbits;
    int frames_noted;
} MPCContext;

static int mpc_probe(AVProbeData *p)
{
    const uint8_t *d = p->buf;
    if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int mpc_read_header(AVFormatContext *s)
{
    MPCContext *c = s->priv_data;
    AVStream *st;

    if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
        av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
        return AVERROR_INVALIDDATA;
    }
    c->ver = avio_r8(s->pb);
    if(c->ver != 0x07 && c->ver != 0x17){
        av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
        return AVERROR_INVALIDDATA;
    }
    c->fcount = avio_rl32(s->pb);
    if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
        av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
        return AVERROR_INVALIDDATA;
    }
    if(c->fcount){
        c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
        if(!c->frames){
            av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
            return AVERROR(ENOMEM);
        }
    }else{
        av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
    }
    c->curframe = 0;
    c->lastframe = -1;
    c->curbits = 8;
    c->frames_noted = 0;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
    st->codec->codec_id = AV_CODEC_ID_MUSEPACK7;
    st->codec->channels = 2;
    st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
    st->codec->bits_per_coded_sample = 16;

    if (ff_get_extradata(st->codec, s->pb, 16) < 0)
        return AVERROR(ENOMEM);
    st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
    avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
    /* scan for seekpoints */
    st->start_time = 0;
    st->duration = c->fcount;

    /* try to read APE tags */
    if (s->pb->seekable) {
        int64_t pos = avio_tell(s->pb);
        ff_ape_parse_tag(s);
        if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
            ff_id3v1_read(s);
        avio_seek(s->pb, pos, SEEK_SET);
    }

    return 0;
}

static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    MPCContext *c = s->priv_data;
    int ret, size, size2, curbits, cur = c->curframe;
    unsigned tmp;
    int64_t pos;

    if (c->curframe >= c->fcount && c->fcount)
        return AVERROR_EOF;

    if(c->curframe != c->lastframe + 1){
        avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
        c->curbits = c->frames[c->curframe].skip;
    }
    c->lastframe = c->curframe;
    c->curframe++;
    curbits = c->curbits;
    pos = avio_tell(s->pb);
    tmp = avio_rl32(s->pb);
    if(curbits <= 12){
        size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
    }else{
        size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
    }
    curbits += 20;
    avio_seek(s->pb, pos, SEEK_SET);

    size = ((size2 + curbits + 31) & ~31) >> 3;
    if(cur == c->frames_noted && c->fcount){
        c->frames[cur].pos = pos;
        c->frames[cur].size = size;
        c->frames[cur].skip = curbits - 20;
        av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
        c->frames_noted++;
    }
    c->curbits = (curbits + size2) & 0x1F;

    if ((ret = av_new_packet(pkt, size + 4)) < 0)
        return ret;

    pkt->data[0] = curbits;
    pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
    pkt->data[2] = 0;
    pkt->data[3] = 0;

    pkt->stream_index = 0;
    pkt->pts = cur;
    ret = avio_read(s->pb, pkt->data + 4, size);
    if(c->curbits)
        avio_seek(s->pb, -4, SEEK_CUR);
    if(ret < size){
        av_free_packet(pkt);
        return ret < 0 ? ret : AVERROR(EIO);
    }
    pkt->size = ret + 4;

    return 0;
}

static int mpc_read_close(AVFormatContext *s)
{
    MPCContext *c = s->priv_data;

    av_freep(&c->frames);
    return 0;
}

/**
 * Seek to the given position
 * If position is unknown but is within the limits of file
 * then packets are skipped unless desired position is reached
 *
 * Also this function makes use of the fact that timestamp == frameno
 */
static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
    AVStream *st = s->streams[stream_index];
    MPCContext *c = s->priv_data;
    AVPacket pkt1, *pkt = &pkt1;
    int ret;
    int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags);
    uint32_t lastframe;

    /* if found, seek there */
    if (index >= 0 && st->index_entries[st->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){
        c->curframe = st->index_entries[index].pos;
        return 0;
    }
    /* if timestamp is out of bounds, return error */
    if(timestamp < 0 || timestamp >= c->fcount)
        return -1;
    timestamp -= DELAY_FRAMES;
    /* seek to the furthest known position and read packets until
       we reach desired position */
    lastframe = c->curframe;
    if(c->frames_noted) c->curframe = c->frames_noted - 1;
    while(c->curframe < timestamp){
        ret = av_read_frame(s, pkt);
        if (ret < 0){
            c->curframe = lastframe;
            return ret;
        }
        av_free_packet(pkt);
    }
    return 0;
}


AVInputFormat ff_mpc_demuxer = {
    .name           = "mpc",
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack"),
    .priv_data_size = sizeof(MPCContext),
    .read_probe     = mpc_probe,
    .read_header    = mpc_read_header,
    .read_packet    = mpc_read_packet,
    .read_close     = mpc_read_close,
    .read_seek      = mpc_read_seek,
    .extensions     = "mpc",
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Musepack demuxer
	3	* Copyright (c) 2006 Konstantin Shishkov
	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 "libavutil/channel_layout.h"
	23	#include "libavcodec/get_bits.h"
	24	#include "avformat.h"
	25	#include "internal.h"
	26	#include "apetag.h"
	27	#include "id3v1.h"
	28	#include "libavutil/dict.h"
	29
	30	#define MPC_FRAMESIZE 1152
	31	#define DELAY_FRAMES 32
	32
	33	static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
	34	typedef struct {
	35	int64_t pos;
	36	int size, skip;
	37	}MPCFrame;
	38
	39	typedef struct {
	40	int ver;
	41	uint32_t curframe, lastframe;
	42	uint32_t fcount;
	43	MPCFrame *frames;
	44	int curbits;
	45	int frames_noted;
	46	} MPCContext;
	47
	48	static int mpc_probe(AVProbeData *p)
	49	{
	50	const uint8_t *d = p->buf;
	51	if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 \|\| d[3] == 0x7))
	52	return AVPROBE_SCORE_MAX;
	53	return 0;
	54	}
	55
	56	static int mpc_read_header(AVFormatContext *s)
	57	{
	58	MPCContext *c = s->priv_data;
	59	AVStream *st;
	60
	61	if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
	62	av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
	63	return AVERROR_INVALIDDATA;
	64	}
65	c->ver = avio_r8(s->pb);
66	if(c->ver != 0x07 && c->ver != 0x17){
67	av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
68	return AVERROR_INVALIDDATA;
69	}
70	c->fcount = avio_rl32(s->pb);
71	if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
72	av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
73	return AVERROR_INVALIDDATA;
74	}
75	if(c->fcount){
76	c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
77	if(!c->frames){
78	av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
79	return AVERROR(ENOMEM);
80	}
81	}else{
82	av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
83	}
84	c->curframe = 0;
85	c->lastframe = -1;
86	c->curbits = 8;
87	c->frames_noted = 0;
88
89	st = avformat_new_stream(s, NULL);
90	if (!st)
91	return AVERROR(ENOMEM);
92	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
93	st->codec->codec_id = AV_CODEC_ID_MUSEPACK7;
94	st->codec->channels = 2;
95	st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
96	st->codec->bits_per_coded_sample = 16;
97
98	if (ff_get_extradata(st->codec, s->pb, 16) < 0)
99	return AVERROR(ENOMEM);
100	st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
101	avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
102	/* scan for seekpoints */
103	st->start_time = 0;
104	st->duration = c->fcount;
105
106	/* try to read APE tags */
107	if (s->pb->seekable) {
108	int64_t pos = avio_tell(s->pb);
109	ff_ape_parse_tag(s);
110	if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
111	ff_id3v1_read(s);
112	avio_seek(s->pb, pos, SEEK_SET);
113	}
114
115	return 0;
116	}
117
118	static int mpc_read_packet(AVFormatContext s, AVPacket pkt)
119	{
120	MPCContext *c = s->priv_data;
121	int ret, size, size2, curbits, cur = c->curframe;
122	unsigned tmp;
123	int64_t pos;
124
125	if (c->curframe >= c->fcount && c->fcount)
126	return AVERROR_EOF;
127
128	if(c->curframe != c->lastframe + 1){
129	avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
130	c->curbits = c->frames[c->curframe].skip;
131	}
132	c->lastframe = c->curframe;
133	c->curframe++;
134	curbits = c->curbits;
135	pos = avio_tell(s->pb);
136	tmp = avio_rl32(s->pb);
137	if(curbits <= 12){
138	size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
139	}else{
140	size2 = (tmp << (curbits - 12) \| avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
141	}
142	curbits += 20;
143	avio_seek(s->pb, pos, SEEK_SET);
144
145	size = ((size2 + curbits + 31) & ~31) >> 3;
146	if(cur == c->frames_noted && c->fcount){
147	c->frames[cur].pos = pos;
148	c->frames[cur].size = size;
149	c->frames[cur].skip = curbits - 20;
150	av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
151	c->frames_noted++;
152	}
153	c->curbits = (curbits + size2) & 0x1F;
154
155	if ((ret = av_new_packet(pkt, size + 4)) < 0)
156	return ret;
157
158	pkt->data[0] = curbits;
159	pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
160	pkt->data[2] = 0;
161	pkt->data[3] = 0;
162
163	pkt->stream_index = 0;
164	pkt->pts = cur;
165	ret = avio_read(s->pb, pkt->data + 4, size);
166	if(c->curbits)
167	avio_seek(s->pb, -4, SEEK_CUR);
168	if(ret < size){
169	av_free_packet(pkt);
170	return ret < 0 ? ret : AVERROR(EIO);
171	}
172	pkt->size = ret + 4;
173
174	return 0;
175	}
176
177	static int mpc_read_close(AVFormatContext *s)
178	{
179	MPCContext *c = s->priv_data;
180
181	av_freep(&c->frames);
182	return 0;
183	}
184
185	/**
186	* Seek to the given position
187	* If position is unknown but is within the limits of file
188	* then packets are skipped unless desired position is reached
189	*
190	* Also this function makes use of the fact that timestamp == frameno
191	*/
192	static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
193	{
194	AVStream *st = s->streams[stream_index];
195	MPCContext *c = s->priv_data;
196	AVPacket pkt1, *pkt = &pkt1;
197	int ret;
198	int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags);
199	uint32_t lastframe;
200
201	/* if found, seek there */
202	if (index >= 0 && st->index_entries[st->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){
203	c->curframe = st->index_entries[index].pos;
204	return 0;
205	}
206	/* if timestamp is out of bounds, return error */
207	if(timestamp < 0 \|\| timestamp >= c->fcount)
208	return -1;
209	timestamp -= DELAY_FRAMES;
210	/* seek to the furthest known position and read packets until
211	we reach desired position */
212	lastframe = c->curframe;
213	if(c->frames_noted) c->curframe = c->frames_noted - 1;
214	while(c->curframe < timestamp){
215	ret = av_read_frame(s, pkt);
216	if (ret < 0){
217	c->curframe = lastframe;
218	return ret;
219	}
220	av_free_packet(pkt);
221	}
222	return 0;
223	}
224
225
226	AVInputFormat ff_mpc_demuxer = {
227	.name = "mpc",
228	.long_name = NULL_IF_CONFIG_SMALL("Musepack"),
229	.priv_data_size = sizeof(MPCContext),
230	.read_probe = mpc_probe,
231	.read_header = mpc_read_header,
232	.read_packet = mpc_read_packet,
233	.read_close = mpc_read_close,
234	.read_seek = mpc_read_seek,
235	.extensions = "mpc",
236	};