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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/common.h>
#include <libavutil/intreadwrite.h>
#include "codec_tags.h"
#include "stheader.h"
#include "common/av_common.h"
static const char *lookup_tag(int type, uint32_t tag)
{
const struct AVCodecTag *av_tags[3] = {0};
switch (type) {
case STREAM_VIDEO: {
av_tags[0] = avformat_get_riff_video_tags();
av_tags[1] = avformat_get_mov_video_tags();
break;
}
case STREAM_AUDIO: {
av_tags[0] = avformat_get_riff_audio_tags();
av_tags[1] = avformat_get_mov_audio_tags();
break;
}
}
int id = av_codec_get_id(av_tags, tag);
return id == AV_CODEC_ID_NONE ? NULL : mp_codec_from_av_codec_id(id);
}
/*
* As seen in the following page:
*
* <https://web.archive.org/web/20220406060153/
* http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html>
*
* Note that the GUID struct in the above citation has its
* integers encoded in little-endian format, which means that
* the unsigned short and unsigned long entries need to be
* byte-flipped for this encoding.
*
* In theory only the first element of this array should be used,
* however some encoders incorrectly encoded the GUID byte-for-byte
* and thus the second one exists as a fallback.
*/
static const unsigned char guid_ext_base[][16] = {
// MEDIASUBTYPE_BASE_GUID
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
0x80, 0x00, 0x00, 0xAA, 0x00, 0x38, 0x9B, 0x71},
// SUBTYPE_AMBISONIC_B_FORMAT_PCM
{0x01, 0x00, 0x00, 0x00, 0x21, 0x07, 0xD3, 0x11,
0x86, 0x44, 0xC8, 0xC1, 0xCA, 0x00, 0x00, 0x00}
};
struct mp_waveformatex_guid {
const char *codec;
const unsigned char guid[16];
};
static const struct mp_waveformatex_guid guid_ext_other[] = {
{"ac3",
{0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11,
0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA}},
{"adpcm_agm",
{0x82, 0xEC, 0x1F, 0x6A, 0xCA, 0xDB, 0x19, 0x45,
0xBD, 0xE7, 0x56, 0xD3, 0xB3, 0xEF, 0x98, 0x1D}},
{"atrac3p",
{0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44,
0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62}},
{"atrac9",
{0xD2, 0x42, 0xE1, 0x47, 0xBA, 0x36, 0x8D, 0x4D,
0x88, 0xFC, 0x61, 0x65, 0x4F, 0x8C, 0x83, 0x6C}},
{"dfpwm",
{0x3A, 0xC1, 0xFA, 0x38, 0x81, 0x1D, 0x43, 0x61,
0xA4, 0x0D, 0xCE, 0x53, 0xCA, 0x60, 0x7C, 0xD1}},
{"eac3",
{0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42,
0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD}},
{"mp2",
{0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11,
0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA}}
};
static void map_audio_pcm_tag(struct mp_codec_params *c)
{
// MS PCM, Extended
if (c->codec_tag == 0xfffe && c->extradata_size >= 22) {
// WAVEFORMATEXTENSIBLE.wBitsPerSample
int bits_per_sample = AV_RL16(c->extradata);
if (bits_per_sample)
c->bits_per_coded_sample = bits_per_sample;
// WAVEFORMATEXTENSIBLE.dwChannelMask
uint64_t chmask = AV_RL32(c->extradata + 2);
struct mp_chmap chmap;
mp_chmap_from_waveext(&chmap, chmask);
if (c->channels.num == chmap.num)
c->channels = chmap;
// WAVEFORMATEXTENSIBLE.SubFormat
unsigned char *subformat = c->extradata + 6;
for (int i = 0; i < MP_ARRAY_SIZE(guid_ext_base); i++) {
if (memcmp(subformat + 4, guid_ext_base[i] + 4, 12) == 0) {
c->codec_tag = AV_RL32(subformat);
c->codec = lookup_tag(c->type, c->codec_tag);
break;
}
}
// extra subformat, not a base one
if (c->codec_tag == 0xfffe) {
for (int i = 0; i < MP_ARRAY_SIZE(guid_ext_other); i++) {
if (memcmp(subformat, &guid_ext_other[i].guid, 16) == 0) {
c->codec = guid_ext_other[i].codec;
c->codec_tag = mp_codec_to_av_codec_id(c->codec);
break;
}
}
}
// Compressed formats might use this.
c->extradata += 22;
c->extradata_size -= 22;
}
int bits = c->bits_per_coded_sample;
if (!bits)
return;
int bytes = (bits + 7) / 8;
switch (c->codec_tag) {
case 0x0: // Microsoft PCM
case 0x1:
if (bytes >= 1 && bytes <= 4)
mp_set_pcm_codec(c, bytes > 1, false, bytes * 8, false);
break;
case 0x3: // IEEE float
mp_set_pcm_codec(c, true, true, bits == 64 ? 64 : 32, false);
break;
}
}
void mp_set_codec_from_tag(struct mp_codec_params *c)
{
c->codec = lookup_tag(c->type, c->codec_tag);
if (c->type == STREAM_AUDIO)
map_audio_pcm_tag(c);
}
void mp_set_pcm_codec(struct mp_codec_params *c, bool sign, bool is_float,
int bits, bool is_be)
{
// This uses libavcodec pcm codec names, e.g. "pcm_u16le".
char codec[64] = "pcm_";
if (is_float) {
mp_snprintf_cat(codec, sizeof(codec), "f");
} else {
mp_snprintf_cat(codec, sizeof(codec), sign ? "s" : "u");
}
mp_snprintf_cat(codec, sizeof(codec), "%d", bits);
if (bits != 8)
mp_snprintf_cat(codec, sizeof(codec), is_be ? "be" : "le");
c->codec = talloc_strdup(c, codec);
}
static const char *const mimetype_to_codec[][2] = {
{"image/apng", "apng"},
{"image/avif", "av1"},
{"image/bmp", "bmp"},
{"image/gif", "gif"},
{"image/jpeg", "mjpeg"},
{"image/jxl", "jpegxl"},
{"image/png", "png"},
{"image/tiff", "tiff"},
{"image/webp", "webp"},
{0}
};
const char *mp_map_mimetype_to_video_codec(const char *mimetype)
{
if (mimetype) {
for (int n = 0; mimetype_to_codec[n][0]; n++) {
if (strcasecmp(mimetype_to_codec[n][0], mimetype) == 0)
return mimetype_to_codec[n][1];
}
}
return NULL;
}
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