1/*
2 * WAV muxer and demuxer
3 * Copyright (c) 2001, 2002 Fabrice Bellard
4 *
5 * Sony Wave64 demuxer
6 * RF64 demuxer
7 * Copyright (c) 2009 Daniel Verkamp
8 *
9 * This file is part of FFmpeg.
10 *
11 * FFmpeg is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * FFmpeg is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with FFmpeg; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25#include "avformat.h"
26#include "raw.h"
27#include "riff.h"
28
29typedef struct {
30    int64_t data;
31    int64_t data_end;
32    int64_t minpts;
33    int64_t maxpts;
34    int last_duration;
35    int w64;
36} WAVContext;
37
38#if CONFIG_WAV_MUXER
39static int wav_write_header(AVFormatContext *s)
40{
41    WAVContext *wav = s->priv_data;
42    ByteIOContext *pb = s->pb;
43    int64_t fmt, fact;
44
45    put_tag(pb, "RIFF");
46    put_le32(pb, 0); /* file length */
47    put_tag(pb, "WAVE");
48
49    /* format header */
50    fmt = ff_start_tag(pb, "fmt ");
51    if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
52        av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
53               s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
54        av_free(wav);
55        return -1;
56    }
57    ff_end_tag(pb, fmt);
58
59    if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
60        && !url_is_streamed(s->pb)) {
61        fact = ff_start_tag(pb, "fact");
62        put_le32(pb, 0);
63        ff_end_tag(pb, fact);
64    }
65
66    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
67    wav->maxpts = wav->last_duration = 0;
68    wav->minpts = INT64_MAX;
69
70    /* data header */
71    wav->data = ff_start_tag(pb, "data");
72
73    put_flush_packet(pb);
74
75    return 0;
76}
77
78static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
79{
80    ByteIOContext *pb  = s->pb;
81    WAVContext    *wav = s->priv_data;
82    put_buffer(pb, pkt->data, pkt->size);
83    if(pkt->pts != AV_NOPTS_VALUE) {
84        wav->minpts        = FFMIN(wav->minpts, pkt->pts);
85        wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
86        wav->last_duration = pkt->duration;
87    } else
88        av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
89    return 0;
90}
91
92static int wav_write_trailer(AVFormatContext *s)
93{
94    ByteIOContext *pb  = s->pb;
95    WAVContext    *wav = s->priv_data;
96    int64_t file_size;
97
98    if (!url_is_streamed(s->pb)) {
99        ff_end_tag(pb, wav->data);
100
101        /* update file size */
102        file_size = url_ftell(pb);
103        url_fseek(pb, 4, SEEK_SET);
104        put_le32(pb, (uint32_t)(file_size - 8));
105        url_fseek(pb, file_size, SEEK_SET);
106
107        put_flush_packet(pb);
108
109        if(s->streams[0]->codec->codec_tag != 0x01) {
110            /* Update num_samps in fact chunk */
111            int number_of_samples;
112            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
113                                           s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
114                                           s->streams[0]->time_base.den);
115            url_fseek(pb, wav->data-12, SEEK_SET);
116            put_le32(pb, number_of_samples);
117            url_fseek(pb, file_size, SEEK_SET);
118            put_flush_packet(pb);
119        }
120    }
121    return 0;
122}
123
124AVOutputFormat wav_muxer = {
125    "wav",
126    NULL_IF_CONFIG_SMALL("WAV format"),
127    "audio/x-wav",
128    "wav",
129    sizeof(WAVContext),
130    CODEC_ID_PCM_S16LE,
131    CODEC_ID_NONE,
132    wav_write_header,
133    wav_write_packet,
134    wav_write_trailer,
135    .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
136};
137#endif /* CONFIG_WAV_MUXER */
138
139
140#if CONFIG_WAV_DEMUXER
141/* return the size of the found tag */
142static int64_t find_tag(ByteIOContext *pb, uint32_t tag1)
143{
144    unsigned int tag;
145    int64_t size;
146
147    for (;;) {
148        if (url_feof(pb))
149            return -1;
150        tag  = get_le32(pb);
151        size = get_le32(pb);
152        if (tag == tag1)
153            break;
154        url_fseek(pb, size, SEEK_CUR);
155    }
156    return size;
157}
158
159static int wav_probe(AVProbeData *p)
160{
161    /* check file header */
162    if (p->buf_size <= 32)
163        return 0;
164    if (!memcmp(p->buf + 8, "WAVE", 4)) {
165        if (!memcmp(p->buf, "RIFF", 4))
166            /*
167              Since ACT demuxer has standard WAV header at top of it's own,
168              returning score is decreased to avoid probe conflict
169              between ACT and WAV.
170            */
171            return AVPROBE_SCORE_MAX - 1;
172        else if (!memcmp(p->buf,      "RF64", 4) &&
173                 !memcmp(p->buf + 12, "ds64", 4))
174            return AVPROBE_SCORE_MAX;
175    }
176    return 0;
177}
178
179/* wav input */
180static int wav_read_header(AVFormatContext *s,
181                           AVFormatParameters *ap)
182{
183    int64_t size, av_uninit(data_size);
184    int rf64;
185    unsigned int tag;
186    ByteIOContext *pb = s->pb;
187    AVStream *st;
188    WAVContext *wav = s->priv_data;
189
190    /* check RIFF header */
191    tag = get_le32(pb);
192
193    rf64 = tag == MKTAG('R', 'F', '6', '4');
194    if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))
195        return -1;
196    get_le32(pb); /* file size */
197    tag = get_le32(pb);
198    if (tag != MKTAG('W', 'A', 'V', 'E'))
199        return -1;
200
201    if (rf64) {
202        if (get_le32(pb) != MKTAG('d', 's', '6', '4'))
203            return -1;
204        size = get_le32(pb);
205        if (size < 16)
206            return -1;
207        get_le64(pb); /* RIFF size */
208        data_size = get_le64(pb);
209        url_fskip(pb, size - 16); /* skip rest of ds64 chunk */
210    }
211
212    /* parse fmt header */
213    size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
214    if (size < 0)
215        return -1;
216    st = av_new_stream(s, 0);
217    if (!st)
218        return AVERROR(ENOMEM);
219
220    ff_get_wav_header(pb, st->codec, size);
221    st->need_parsing = AVSTREAM_PARSE_FULL;
222
223    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
224
225    size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
226    if (rf64)
227        size = data_size;
228    if (size < 0)
229        return -1;
230    if (!size) {
231        wav->data_end = INT64_MAX;
232    } else
233        wav->data_end= url_ftell(pb) + size;
234    return 0;
235}
236
237/** Find chunk with w64 GUID by skipping over other chunks
238 * @return the size of the found chunk
239 */
240static int64_t find_guid(ByteIOContext *pb, const uint8_t guid1[16])
241{
242    uint8_t guid[16];
243    int64_t size;
244
245    while (!url_feof(pb)) {
246        get_buffer(pb, guid, 16);
247        size = get_le64(pb);
248        if (size <= 24)
249            return -1;
250        if (!memcmp(guid, guid1, 16))
251            return size;
252        url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
253    }
254    return -1;
255}
256
257static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
258    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
259
260#define MAX_SIZE 4096
261
262static int wav_read_packet(AVFormatContext *s,
263                           AVPacket *pkt)
264{
265    int ret, size;
266    int64_t left;
267    AVStream *st;
268    WAVContext *wav = s->priv_data;
269
270    st = s->streams[0];
271
272    left = wav->data_end - url_ftell(s->pb);
273    if (left <= 0){
274        if (CONFIG_W64_DEMUXER && wav->w64)
275            left = find_guid(s->pb, guid_data) - 24;
276        else
277            left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
278        if (left < 0)
279            return AVERROR_EOF;
280        wav->data_end= url_ftell(s->pb) + left;
281    }
282
283    size = MAX_SIZE;
284    if (st->codec->block_align > 1) {
285        if (size < st->codec->block_align)
286            size = st->codec->block_align;
287        size = (size / st->codec->block_align) * st->codec->block_align;
288    }
289    size = FFMIN(size, left);
290    ret  = av_get_packet(s->pb, pkt, size);
291    if (ret < 0)
292        return ret;
293    pkt->stream_index = 0;
294
295    return ret;
296}
297
298static int wav_read_seek(AVFormatContext *s,
299                         int stream_index, int64_t timestamp, int flags)
300{
301    AVStream *st;
302
303    st = s->streams[0];
304    switch (st->codec->codec_id) {
305    case CODEC_ID_MP2:
306    case CODEC_ID_MP3:
307    case CODEC_ID_AC3:
308    case CODEC_ID_DTS:
309        /* use generic seeking with dynamically generated indexes */
310        return -1;
311    default:
312        break;
313    }
314    return pcm_read_seek(s, stream_index, timestamp, flags);
315}
316
317AVInputFormat wav_demuxer = {
318    "wav",
319    NULL_IF_CONFIG_SMALL("WAV format"),
320    sizeof(WAVContext),
321    wav_probe,
322    wav_read_header,
323    wav_read_packet,
324    NULL,
325    wav_read_seek,
326    .flags= AVFMT_GENERIC_INDEX,
327    .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
328};
329#endif /* CONFIG_WAV_DEMUXER */
330
331
332#if CONFIG_W64_DEMUXER
333static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
334    0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
335
336static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
337    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
338
339static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
340    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
341
342static int w64_probe(AVProbeData *p)
343{
344    if (p->buf_size <= 40)
345        return 0;
346    if (!memcmp(p->buf,      guid_riff, 16) &&
347        !memcmp(p->buf + 24, guid_wave, 16))
348        return AVPROBE_SCORE_MAX;
349    else
350        return 0;
351}
352
353static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
354{
355    int64_t size;
356    ByteIOContext *pb  = s->pb;
357    WAVContext    *wav = s->priv_data;
358    AVStream *st;
359    uint8_t guid[16];
360
361    get_buffer(pb, guid, 16);
362    if (memcmp(guid, guid_riff, 16))
363        return -1;
364
365    if (get_le64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
366        return -1;
367
368    get_buffer(pb, guid, 16);
369    if (memcmp(guid, guid_wave, 16)) {
370        av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
371        return -1;
372    }
373
374    size = find_guid(pb, guid_fmt);
375    if (size < 0) {
376        av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
377        return -1;
378    }
379
380    st = av_new_stream(s, 0);
381    if (!st)
382        return AVERROR(ENOMEM);
383
384    /* subtract chunk header size - normal wav file doesn't count it */
385    ff_get_wav_header(pb, st->codec, size - 24);
386    url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
387
388    st->need_parsing = AVSTREAM_PARSE_FULL;
389
390    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
391
392    size = find_guid(pb, guid_data);
393    if (size < 0) {
394        av_log(s, AV_LOG_ERROR, "could not find data guid\n");
395        return -1;
396    }
397    wav->data_end = url_ftell(pb) + size - 24;
398    wav->w64      = 1;
399
400    return 0;
401}
402
403AVInputFormat w64_demuxer = {
404    "w64",
405    NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
406    sizeof(WAVContext),
407    w64_probe,
408    w64_read_header,
409    wav_read_packet,
410    NULL,
411    wav_read_seek,
412    .flags = AVFMT_GENERIC_INDEX,
413    .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
414};
415#endif /* CONFIG_W64_DEMUXER */
416