236 lines
8.2 KiB
C
236 lines
8.2 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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#ifdef VGM_USE_FFMPEG
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typedef struct {
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int channels;
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int sample_rate;
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int32_t num_samples;
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int loop_flag;
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int32_t loop_start;
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int32_t loop_end;
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int32_t encoder_delay;
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int subsongs;
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} mp4_header;
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static void parse_mp4(STREAMFILE* sf, mp4_header* mp4);
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VGMSTREAM* init_vgmstream_mp4_aac_ffmpeg(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset = 0;
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mp4_header mp4 = {0};
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size_t file_size;
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ffmpeg_codec_data* ffmpeg_data = NULL;
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/* checks */
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if ((read_u32be(0x00,sf) & 0xFFFFFF00) != 0) /* first atom BE size (usually ~0x18) */
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goto fail;
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if (!is_id32be(0x04,sf, "ftyp"))
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goto fail;
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/* .bin: Final Fantasy Dimensions (iOS), Final Fantasy V (iOS)
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* .msd: UNO (iOS) */
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if (!check_extensions(sf,"mp4,m4a,m4v,lmp4,bin,lbin,msd"))
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goto fail;
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file_size = get_streamfile_size(sf);
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ffmpeg_data = init_ffmpeg_offset(sf, start_offset, file_size);
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if (!ffmpeg_data) goto fail;
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parse_mp4(sf, &mp4);
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/* most values aren't read directly and use FFmpeg b/c MP4 makes things hard */
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if (!mp4.num_samples)
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mp4.num_samples = ffmpeg_get_samples(ffmpeg_data); /* does this take into account encoder delay? see FFV */
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if (!mp4.channels)
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mp4.channels = ffmpeg_get_channels(ffmpeg_data);
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if (!mp4.sample_rate)
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mp4.sample_rate = ffmpeg_get_sample_rate(ffmpeg_data);
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if (!mp4.subsongs)
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mp4.subsongs = ffmpeg_get_subsong_count(ffmpeg_data); /* may contain N tracks */
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(mp4.channels, mp4.loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->meta_type = meta_MP4;
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vgmstream->sample_rate = mp4.sample_rate;
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vgmstream->num_samples = mp4.num_samples;
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vgmstream->loop_start_sample = mp4.loop_start;
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vgmstream->loop_end_sample = mp4.loop_end;
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vgmstream->codec_data = ffmpeg_data;
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vgmstream->coding_type = coding_FFmpeg;
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vgmstream->layout_type = layout_none;
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vgmstream->num_streams = mp4.subsongs;
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vgmstream->channel_layout = ffmpeg_get_channel_layout(ffmpeg_data);
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/* needed for CRI MP4, otherwise FFmpeg usually reads standard delay */
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ffmpeg_set_skip_samples(vgmstream->codec_data, mp4.encoder_delay);
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return vgmstream;
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fail:
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free_ffmpeg(ffmpeg_data);
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if (vgmstream) {
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vgmstream->codec_data = NULL;
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close_vgmstream(vgmstream);
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}
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return NULL;
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}
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/* read useful MP4 chunks */
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static void parse_mp4(STREAMFILE* sf, mp4_header* mp4) {
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uint32_t offset, suboffset, max_offset, max_suboffset;
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/* MOV format chunks, called "atoms", size goes first because Apple */
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offset = 0x00;
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max_offset = get_streamfile_size(sf);
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while (offset < max_offset) {
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uint32_t size = read_u32be(offset + 0x00,sf);
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uint32_t type = read_u32be(offset + 0x04,sf);
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//offset += 0x08;
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/* just in case */
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if (size == 0)
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break;
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switch(type) {
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case 0x66726565: /* "free" */
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/* Tales of Hearts R (iOS) has loop info in the first "free" atom */
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if (read_u32be(offset + 0x08,sf) == 0x4F700002 && (size == 0x38 || size == 0x40)) {
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/* 0x00: id / "Op" */
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/* 0x02: channels */
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/* 0x04/8: sample rate */
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/* 0x0c: null? */
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/* 0x10: num_samples (without padding, same as FFmpeg's) */
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/* 0x14/18/1c/20: offsets to stream info (stts/stsc/stsz/stco) */
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mp4->encoder_delay = read_u32be(offset + 0x08 + 0x24,sf); /* Apple's 2112 */
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mp4->loop_flag = read_u32be(offset + 0x08 + 0x28,sf);
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if (mp4->loop_flag) { /* atom ends if no loop flag */
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mp4->loop_start = read_u32be(offset + 0x08 + 0x2c,sf);
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mp4->loop_end = read_u32be(offset + 0x08 + 0x30,sf);
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}
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max_offset = 0;
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}
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/* M2 emu's .m4a (codename zoom) */
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else if (is_id32be(offset + 0x08 + 0x00,sf, "ZOOM")) {
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/* 0x00: id */
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mp4->encoder_delay = read_s32be(offset + 0x08 + 0x04,sf); /* Apple's 2112, also in iTunes tag */
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/* 0x08: end padding */
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mp4->num_samples = read_s32be(offset + 0x08 + 0x0c,sf);
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mp4->loop_start = read_s32be(offset + 0x08 + 0x10,sf);
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mp4->loop_end = read_s32be(offset + 0x08 + 0x14,sf);
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mp4->loop_flag = (mp4->loop_end != 0);
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if (mp4->loop_flag)
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mp4->loop_end++; /* assumed, matches num_samples this way */
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max_offset = 0;
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}
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break;
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case 0x6D6F6F76: { /* "moov" (header) */
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suboffset = offset + 0x08;
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max_suboffset = offset + size;
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while (suboffset < max_suboffset) {
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uint32_t subsize = read_u32be(suboffset + 0x00,sf);
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uint32_t subtype = read_u32be(suboffset + 0x04,sf);
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/* padded in ToRR */
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if (subsize == 0)
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break;
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switch(subtype) {
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case 0x75647461: /* "udta" */
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/* CRI subchunk [Imperial SaGa Eclipse (Browser)]
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* incidentally "moov" header comes after data ("mdat") in CRI's files */
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if (subsize >= 0x28 && is_id32be(suboffset + 0x08 + 0x04,sf, "criw")) {
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off_t criw_offset = suboffset + 0x08 + 0x08;
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mp4->loop_start = read_s32be(criw_offset + 0x00,sf);
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mp4->loop_end = read_s32be(criw_offset + 0x04,sf);
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mp4->encoder_delay = read_s32be(criw_offset + 0x08,sf); /* Apple's 2112 */
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mp4->num_samples = read_s32be(criw_offset + 0x0c,sf);
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mp4->loop_flag = (mp4->loop_end > 0);
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/* next 2 fields are null */
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max_offset = 0;
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}
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break;
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default:
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break;
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}
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suboffset += subsize;
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}
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break;
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}
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default:
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break;
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}
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offset += size; /* atoms don't seem to need to padding byte, unlike RIFF */
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}
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}
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/* CRI's encryption info (for lack of a better place) [Final Fantasy Digital Card Game (Browser)]
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*
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* Like other CRI stuff their MP4 can be encrypted, from file's beginning (including headers).
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* This is more or less how data is decrypted (supposedly, from decompilations), for reference:
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*/
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#if 0
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void criAacCodec_SetDecryptionKey(uint64_t keycode, uint16_t* key) {
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if (!keycode)
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return;
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uint16_t k0 = 4 * ((keycode >> 0) & 0x0FFF) | 1;
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uint16_t k1 = 2 * ((keycode >> 12) & 0x1FFF) | 1;
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uint16_t k2 = 4 * ((keycode >> 25) & 0x1FFF) | 1;
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uint16_t k3 = 2 * ((keycode >> 38) & 0x3FFF) | 1;
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key[0] = k0 ^ k1;
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key[1] = k1 ^ k2;
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key[2] = k2 ^ k3;
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key[3] = ~k3;
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/* criatomexacb_generate_aac_decryption_key is slightly different, unsure which one is used: */
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//key[0] = k0 ^ k3;
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//key[1] = k2 ^ k3;
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//key[2] = k2 ^ k3;
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//key[3] = ~k3;
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}
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void criAacCodec_DecryptData(const uint16_t* key, uint8_t* data, uint32_t size) {
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if (data_size)
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return;
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uint16_t seed0 = ~key[3];
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uint16_t seed1 = seed0 ^ key[2];
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uint16_t seed2 = seed1 ^ key[1];
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uint16_t seed3 = seed2 ^ key[0];
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uint16_t xor = 2 * seed0 | 1;
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uint16_t add = 2 * seed0 | 1; /* not seed1 */
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uint16_t mul = 4 * seed2 | 1;
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for (int i = 0; i < data_size; i++) {
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if (!(uint16_t)i) { /* every 0x10000, without modulo */
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mul = (4 * seed2 + seed3 * (mul & 0xFFFC)) & 0xFFFD | 1;
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add = (2 * seed0 + seed1 * (add & 0xFFFE)) | 1;
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}
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xor = xor * mul + add;
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*data ^= (xor >> 8) & 0xFF;
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++data;
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}
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}
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#endif
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#endif
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