From fc11dd059b5c7369a51ddcca532505b588bd0030 Mon Sep 17 00:00:00 2001 From: notaz Date: Mon, 1 Jul 2013 03:40:31 +0300 Subject: [PATCH] support mp3 decoding over libavcodec --- Makefile | 5 + configure | 21 +++- jni/Android.mk | 1 + platform/common/mp3.c | 165 +++++++++++++++++++++++++++++- platform/common/mp3.h | 11 ++ platform/common/mp3_dummy.c | 11 +- platform/common/mp3_helix.c | 167 ++++--------------------------- platform/common/mp3_libavcodec.c | 117 ++++++++++++++++++++++ platform/common/plat_sdl.c | 2 +- 9 files changed, 342 insertions(+), 158 deletions(-) create mode 100644 platform/common/mp3_libavcodec.c diff --git a/Makefile b/Makefile index b1d8f39..f36aaad 100644 --- a/Makefile +++ b/Makefile @@ -110,7 +110,12 @@ endif endif # USE_FRONTEND +OBJS += platform/common/mp3.o +ifeq "$(HAVE_LIBAVCODEC)" "1" +OBJS += platform/common/mp3_libavcodec.o +else OBJS += platform/common/mp3_dummy.o +endif # zlib OBJS += zlib/gzio.o zlib/inffast.o zlib/inflate.o zlib/inftrees.o zlib/trees.o \ diff --git a/configure b/configure index c3309b5..314cd95 100755 --- a/configure +++ b/configure @@ -39,7 +39,7 @@ have_armv5="" have_armv6="" have_armv7="" have_arm_neon="" -have_tslib="" +have_libavcodec="" enable_dynarec="yes" need_sdl="no" need_xlib="no" @@ -274,12 +274,26 @@ EOF compile_binary "$@" } +check_libavcodec() +{ + cat > $TMPC < + void main() { avcodec_decode_audio3(0, 0, 0, 0); } +EOF + compile_binary "$@" -lavcodec +} + #MAIN_LDLIBS="$MAIN_LDLIBS -lz" #check_zlib || fail "please install zlib (libz-dev)" MAIN_LDLIBS="-lpng $MAIN_LDLIBS" check_libpng || fail "please install libpng (libpng-dev)" +if check_libavcodec; then + have_libavcodec="yes" + MAIN_LDLIBS="-lavcodec $MAIN_LDLIBS" +fi + # find what audio support we can compile if [ "x$sound_drivers" = "x" ]; then if check_oss; then sound_drivers="$sound_drivers oss"; fi @@ -320,6 +334,7 @@ fi test "x$have_armv6" != "x" || have_armv6="no" test "x$have_armv7" != "x" || have_armv7="no" test "x$have_arm_neon" != "x" || have_arm_neon="no" +test "x$have_libavcodec" != "x" || have_libavcodec="no" echo "architecture $ARCH" echo "platform $platform" @@ -328,6 +343,7 @@ echo "C compiler $CC" echo "C compiler flags $CFLAGS" echo "libraries $MAIN_LDLIBS" echo "linker flags $LDFLAGS" +echo "libavcodec (mp3) $have_libavcodec" echo "enable dynarec $enable_dynarec" # echo "ARMv7 optimizations $have_armv7" # echo "enable ARM NEON $have_arm_neon" @@ -349,6 +365,9 @@ echo >> $config_mak echo "ARCH = $ARCH" >> $config_mak echo "PLATFORM = $platform" >> $config_mak echo "SOUND_DRIVERS = $sound_drivers" >> $config_mak +if [ "$have_libavcodec" = "yes" ]; then + echo "HAVE_LIBAVCODEC = 1" >> $config_mak +fi if [ "$have_arm_neon" = "yes" ]; then echo "HAVE_NEON = 1" >> $config_mak fi diff --git a/jni/Android.mk b/jni/Android.mk index 511bf77..8389f7e 100644 --- a/jni/Android.mk +++ b/jni/Android.mk @@ -60,6 +60,7 @@ include $(R)platform/common/common.mak LOCAL_SRC_FILES += $(SRCS_COMMON) LOCAL_SRC_FILES += $(R)platform/libretro.c +LOCAL_SRC_FILES += $(R)platform/common/mp3.c LOCAL_SRC_FILES += $(R)platform/common/mp3_dummy.c # zlib/unzip diff --git a/platform/common/mp3.c b/platform/common/mp3.c index 1a240eb..9b347e8 100644 --- a/platform/common/mp3.c +++ b/platform/common/mp3.c @@ -1,12 +1,26 @@ /* * PicoDrive - * (C) notaz, 2010 + * (C) notaz, 2010,2013 * * This work is licensed under the terms of MAME license. * See COPYING file in the top-level directory. */ +#include +#include + +#include +#include #include "mp3.h" +static FILE *mp3_current_file; +static int mp3_file_len, mp3_file_pos; +static int cdda_out_pos; +static int decoder_active; + +unsigned short mpeg1_l3_bitrates[16] = { + 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 +}; + int mp3_find_sync_word(const unsigned char *buf, int size) { const unsigned char *p, *pe; @@ -34,3 +48,152 @@ int mp3_find_sync_word(const unsigned char *buf, int size) return -1; } +static int try_get_bitrate(unsigned char *buf, int buf_size) +{ + int offs1, offs = 0; + int ret; + + while (1) + { + offs1 = mp3_find_sync_word(buf + offs, buf_size - offs); + if (offs1 < 0) + return -2; + offs += offs1; + if (buf_size - offs < 4) + return -3; + + // printf("trying header %08x\n", *(int *)(buf + offs)); + + ret = mpeg1_l3_bitrates[buf[offs + 2] >> 4]; + if (ret > 0) + return ret; + } + + return -2; +} + +int mp3_get_bitrate(void *f_, int len) +{ + unsigned char buf[2048]; + FILE *f = f_; + int retval = -1; + int ret; + + memset(buf, 0, sizeof(buf)); + + fseek(f, 0, SEEK_SET); + ret = fread(buf, 1, sizeof(buf), f); + if (ret != sizeof(buf)) + goto out; + + ret = try_get_bitrate(buf, sizeof(buf)); + if (ret <= 0) { + // try to read somewhere around the middle + fseek(f, len / 2, SEEK_SET); + fread(buf, 1, sizeof(buf), f); + ret = try_get_bitrate(buf, sizeof(buf)); + } + if (ret > 0) + retval = ret; + + //printf("bitrate: %i\n", retval); + +out: + fseek(f, 0, SEEK_SET); + return retval; +} + +void mp3_start_play(void *f_, int pos) +{ + unsigned char buf[2048]; + FILE *f = f_; + int ret; + + mp3_file_len = mp3_file_pos = 0; + mp3_current_file = NULL; + cdda_out_pos = 0; + decoder_active = 0; + + if (!(PicoOpt & POPT_EN_MCD_CDDA) || f == NULL) // cdda disabled or no file? + return; + + ret = mp3dec_start(); + if (ret != 0) + return; + + decoder_active = 1; + + mp3_current_file = f; + fseek(f, 0, SEEK_END); + mp3_file_len = ftell(f); + + // search for first sync word, skipping stuff like ID3 tags + while (mp3_file_pos < 128*1024) { + int offs, bytes; + + fseek(f, mp3_file_pos, SEEK_SET); + bytes = fread(buf, 1, sizeof(buf), f); + if (bytes < 4) + break; + offs = mp3_find_sync_word(buf, bytes); + if (offs >= 0) { + mp3_file_pos += offs; + break; + } + mp3_file_pos += bytes - 3; + } + + // seek.. + if (pos) { + unsigned long long pos64 = mp3_file_len - mp3_file_pos; + pos64 *= pos; + mp3_file_pos += pos64 >> 10; + } + + mp3dec_decode(mp3_current_file, &mp3_file_pos, mp3_file_len); +} + +void mp3_update(int *buffer, int length, int stereo) +{ + int length_mp3, shr = 0; + void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32; + + if (mp3_current_file == NULL || mp3_file_pos >= mp3_file_len) + return; /* no file / EOF */ + + if (!decoder_active) + return; + + length_mp3 = length; + if (PsndRate <= 11025 + 100) { + mix_samples = mix_16h_to_32_s2; + length_mp3 <<= 2; shr = 2; + } + else if (PsndRate <= 22050 + 100) { + mix_samples = mix_16h_to_32_s1; + length_mp3 <<= 1; shr = 1; + } + + if (1152 - cdda_out_pos >= length_mp3) { + mix_samples(buffer, cdda_out_buffer + cdda_out_pos * 2, + length * 2); + + cdda_out_pos += length_mp3; + } else { + int ret, left = 1152 - cdda_out_pos; + + mix_samples(buffer, cdda_out_buffer + cdda_out_pos * 2, + (left >> shr) * 2); + + ret = mp3dec_decode(mp3_current_file, &mp3_file_pos, + mp3_file_len); + if (ret == 0) { + cdda_out_pos = length_mp3 - left; + mix_samples(buffer + (left >> shr) * 2, + cdda_out_buffer, + (cdda_out_pos >> shr) * 2); + } else + cdda_out_pos = 0; + } +} + diff --git a/platform/common/mp3.h b/platform/common/mp3.h index da0987a..26c4a3c 100644 --- a/platform/common/mp3.h +++ b/platform/common/mp3.h @@ -1,8 +1,19 @@ +#ifndef __COMMON_MP3_H__ +#define __COMMON_MP3_H__ + +#include int mp3_find_sync_word(const unsigned char *buf, int size); +/* decoder */ +int mp3dec_start(void); +int mp3dec_decode(FILE *f, int *file_pos, int file_len); + +extern unsigned short mpeg1_l3_bitrates[16]; + #ifdef __GP2X__ void mp3_update_local(int *buffer, int length, int stereo); void mp3_start_play_local(void *f, int pos); #endif +#endif // __COMMON_MP3_H__ diff --git a/platform/common/mp3_dummy.c b/platform/common/mp3_dummy.c index a76caf9..7d0ef9e 100644 --- a/platform/common/mp3_dummy.c +++ b/platform/common/mp3_dummy.c @@ -6,18 +6,15 @@ * See COPYING file in the top-level directory. */ +#include #include "mp3.h" -#include -int mp3_get_bitrate(void *f_, int len) +int mp3dec_start(void) { return -1; } -void mp3_start_play(void *f_, int pos) -{ -} - -void mp3_update(int *buffer, int length, int stereo) +int mp3dec_decode(FILE *f, int *file_pos, int file_len) { + return -1; } diff --git a/platform/common/mp3_helix.c b/platform/common/mp3_helix.c index 8ff66d8..62e9189 100644 --- a/platform/common/mp3_helix.c +++ b/platform/common/mp3_helix.c @@ -16,74 +16,15 @@ #include "mp3.h" #include "lprintf.h" -static HMP3Decoder mp3dec = 0; -static FILE *mp3_current_file = NULL; -static int mp3_file_len = 0, mp3_file_pos = 0; -static int mp3_buffer_offs = 0; -static unsigned char mp3_input_buffer[2*1024]; +static HMP3Decoder mp3dec; +static unsigned char mp3_input_buffer[2 * 1024]; #ifdef __GP2X__ #define mp3_update mp3_update_local #define mp3_start_play mp3_start_play_local #endif -static int try_get_header(unsigned char *buff, MP3FrameInfo *fi) -{ - int ret, offs1, offs = 0; - - while (1) - { - offs1 = mp3_find_sync_word(buff + offs, 2048 - offs); - if (offs1 < 0) return -2; - offs += offs1; - if (2048 - offs < 4) return -3; - - // printf("trying header %08x\n", *(int *)(buff + offs)); - - ret = MP3GetNextFrameInfo(mp3dec, fi, buff + offs); - if (ret == 0 && fi->bitrate != 0) break; - offs++; - } - - return ret; -} - -int mp3_get_bitrate(void *f_, int len) -{ - unsigned char buff[2048]; - MP3FrameInfo fi; - FILE *f = f_; - int ret; - - memset(buff, 0, sizeof(buff)); - - if (mp3dec) - MP3FreeDecoder(mp3dec); - mp3dec = MP3InitDecoder(); - - fseek(f, 0, SEEK_SET); - ret = fread(buff, 1, sizeof(buff), f); - fseek(f, 0, SEEK_SET); - if (ret <= 0) - return -1; - - ret = try_get_header(buff, &fi); - if (ret != 0 || fi.bitrate == 0) { - // try to read somewhere around the middle - fseek(f, len>>1, SEEK_SET); - fread(buff, 1, 2048, f); - fseek(f, 0, SEEK_SET); - ret = try_get_header(buff, &fi); - } - if (ret != 0) - return ret; - - // printf("bitrate: %i\n", fi.bitrate / 1000); - - return fi.bitrate / 1000; -} - -static int mp3_decode(void) +int mp3dec_decode(FILE *f, int *file_pos, int file_len) { unsigned char *readPtr; int bytesLeft; @@ -93,16 +34,17 @@ static int mp3_decode(void) do { - if (mp3_file_pos >= mp3_file_len) + if (*file_pos >= file_len) return 1; /* EOF, nothing to do */ - fseek(mp3_current_file, mp3_file_pos, SEEK_SET); - bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), mp3_current_file); + fseek(f, *file_pos, SEEK_SET); + bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), f); offset = mp3_find_sync_word(mp3_input_buffer, bytesLeft); if (offset < 0) { - lprintf("find_sync_word (%i/%i) err %i\n", mp3_file_pos, mp3_file_len, offset); - mp3_file_pos = mp3_file_len; + lprintf("find_sync_word (%i/%i) err %i\n", + *file_pos, file_len, offset); + *file_pos = file_len; return 1; // EOF } readPtr = mp3_input_buffer + offset; @@ -113,112 +55,41 @@ static int mp3_decode(void) if (err) { if (err == ERR_MP3_MAINDATA_UNDERFLOW && !had_err) { // just need another frame - mp3_file_pos += readPtr - mp3_input_buffer; + *file_pos += readPtr - mp3_input_buffer; continue; } if (err == ERR_MP3_INDATA_UNDERFLOW && !had_err) { if (offset == 0) // something's really wrong here, frame had to fit - mp3_file_pos = mp3_file_len; + *file_pos = file_len; else - mp3_file_pos += offset; + *file_pos += offset; continue; } if (-12 <= err && err <= -6) { // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_* // just try to skip the offending frame.. - mp3_file_pos += offset + 1; + *file_pos += offset + 1; continue; } - lprintf("MP3Decode err (%i/%i) %i\n", mp3_file_pos, mp3_file_len, err); - mp3_file_pos = mp3_file_len; + lprintf("MP3Decode err (%i/%i) %i\n", + *file_pos, file_len, err); + *file_pos = file_len; return 1; } - mp3_file_pos += readPtr - mp3_input_buffer; + *file_pos += readPtr - mp3_input_buffer; } while (0); return 0; } -void mp3_start_play(void *f_, int pos) +int mp3dec_start(void) { - FILE *f = f_; - - mp3_file_len = mp3_file_pos = 0; - mp3_current_file = NULL; - mp3_buffer_offs = 0; - - if (!(PicoOpt & POPT_EN_MCD_CDDA) || f == NULL) // cdda disabled or no file? - return; - // must re-init decoder for new track if (mp3dec) MP3FreeDecoder(mp3dec); mp3dec = MP3InitDecoder(); - mp3_current_file = f; - fseek(f, 0, SEEK_END); - mp3_file_len = ftell(f); - - // search for first sync word, skipping stuff like ID3 tags - while (mp3_file_pos < 128*1024) { - int offs, bytes; - - fseek(f, mp3_file_pos, SEEK_SET); - bytes = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), f); - if (bytes < 4) - break; - offs = mp3_find_sync_word(mp3_input_buffer, bytes); - if (offs >= 0) { - mp3_file_pos += offs; - break; - } - mp3_file_pos += bytes - 2; - } - - // seek.. - if (pos) { - unsigned long long pos64 = mp3_file_len - mp3_file_pos; - pos64 *= pos; - mp3_file_pos += pos64 >> 10; - } - - mp3_decode(); -} - -void mp3_update(int *buffer, int length, int stereo) -{ - int length_mp3, shr = 0; - void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32; - - if (mp3_current_file == NULL || mp3_file_pos >= mp3_file_len) - return; /* no file / EOF */ - - length_mp3 = length; - if (PsndRate <= 11025 + 100) { - mix_samples = mix_16h_to_32_s2; - length_mp3 <<= 2; shr = 2; - } - else if (PsndRate <= 22050 + 100) { - mix_samples = mix_16h_to_32_s1; - length_mp3 <<= 1; shr = 1; - } - - if (1152 - mp3_buffer_offs >= length_mp3) { - mix_samples(buffer, cdda_out_buffer + mp3_buffer_offs*2, length<<1); - - mp3_buffer_offs += length_mp3; - } else { - int ret, left = 1152 - mp3_buffer_offs; - - mix_samples(buffer, cdda_out_buffer + mp3_buffer_offs*2, (left>>shr)<<1); - ret = mp3_decode(); - if (ret == 0) { - mp3_buffer_offs = length_mp3 - left; - mix_samples(buffer + ((left>>shr)<<1), cdda_out_buffer, (mp3_buffer_offs>>shr)<<1); - } else - mp3_buffer_offs = 0; - } + return (mp3dec == 0) ? -1 : 0; } - diff --git a/platform/common/mp3_libavcodec.c b/platform/common/mp3_libavcodec.c new file mode 100644 index 0000000..833b30b --- /dev/null +++ b/platform/common/mp3_libavcodec.c @@ -0,0 +1,117 @@ +/* + * Some mp3 related code for Sega/Mega CD. + * Uses Libav/FFmpeg libavcodec + * (C) notaz, 2013 + * + * This work is licensed under the terms of MAME license. + * See COPYING file in the top-level directory. + */ + +#include +#include +#include + +#include +#include "../libpicofe/lprintf.h" +#include "mp3.h" + +static AVCodecContext *ctx; + +int mp3dec_decode(FILE *f, int *file_pos, int file_len) +{ + unsigned char input_buf[2 * 1024]; + int frame_size; + AVPacket avpkt; + int bytes_in; + int bytes_out; + int offset; + int len; + + av_init_packet(&avpkt); + + do + { + if (*file_pos >= file_len) + return 1; // EOF, nothing to do + + fseek(f, *file_pos, SEEK_SET); + bytes_in = fread(input_buf, 1, sizeof(input_buf), f); + + offset = mp3_find_sync_word(input_buf, bytes_in); + if (offset < 0) { + lprintf("find_sync_word (%i/%i) err %i\n", + *file_pos, file_len, offset); + *file_pos = file_len; + return 1; // EOF + } + + // to avoid being flooded with "incorrect frame size" errors, + // we must calculate and pass exact frame size - lame + frame_size = mpeg1_l3_bitrates[input_buf[offset + 2] >> 4]; + frame_size = frame_size * 144000 / 44100; + frame_size += (input_buf[offset + 2] >> 1) & 1; + + if (offset > 0 && bytes_in - offset < frame_size) { + // underflow + *file_pos += offset; + continue; + } + + avpkt.data = input_buf + offset; + avpkt.size = frame_size; + bytes_out = sizeof(cdda_out_buffer); + + len = avcodec_decode_audio3(ctx, cdda_out_buffer, + &bytes_out, &avpkt); + if (len <= 0) { + lprintf("mp3 decode err (%i/%i) %i\n", + *file_pos, file_len, len); + + // attempt to skip the offending frame.. + *file_pos += offset + 1; + continue; + } + + *file_pos += offset + len; + } + while (0); + + return 0; +} + +int mp3dec_start(void) +{ + AVCodec *codec; + int ret; + + if (ctx != NULL) + return 0; + + // init decoder + + //avcodec_init(); + avcodec_register_all(); + + // AV_CODEC_ID_MP3 ? + codec = avcodec_find_decoder(CODEC_ID_MP3); + if (codec == NULL) { + lprintf("mp3dec: codec missing\n"); + return -1; + } + + ctx = avcodec_alloc_context(); + if (ctx == NULL) { + lprintf("mp3dec: avcodec_alloc_context failed\n"); + return -1; + } + + ret = avcodec_open(ctx, codec); + if (ret < 0) { + lprintf("mp3dec: avcodec_open failed: %d\n", ret); + av_free(ctx); + ctx = NULL; + return -1; + } + + return 0; +} diff --git a/platform/common/plat_sdl.c b/platform/common/plat_sdl.c index d8935ac..8ea266f 100644 --- a/platform/common/plat_sdl.c +++ b/platform/common/plat_sdl.c @@ -217,7 +217,7 @@ void plat_init(void) plat_sdl_quit_cb = plat_sdl_quit; - SDL_WM_SetCaption("PicoDrive" VERSION, NULL); + SDL_WM_SetCaption("PicoDrive " VERSION, NULL); g_menuscreen_w = plat_sdl_screen->w; g_menuscreen_h = plat_sdl_screen->h; -- 2.39.2