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🎥 Command line media player
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C
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#include <limits.h>
#include "common/common.h"#include "format.h"
// number of bytes per sample, 0 if invalid/unknownint af_fmt_to_bytes(int format){ switch (af_fmt_from_planar(format)) { case AF_FORMAT_U8: return 1; case AF_FORMAT_S16: return 2; case AF_FORMAT_S32: return 4; case AF_FORMAT_S64: return 8; case AF_FORMAT_FLOAT: return 4; case AF_FORMAT_DOUBLE: return 8; } if (af_fmt_is_spdif(format)) return 2; return 0;}
// All formats are considered signed, except explicitly unsigned int formats.bool af_fmt_is_unsigned(int format){ return format == AF_FORMAT_U8 || format == AF_FORMAT_U8P;}
bool af_fmt_is_float(int format){ format = af_fmt_from_planar(format); return format == AF_FORMAT_FLOAT || format == AF_FORMAT_DOUBLE;}
// true for both unsigned and signed intsbool af_fmt_is_int(int format){ return format && !af_fmt_is_spdif(format) && !af_fmt_is_float(format);}
bool af_fmt_is_spdif(int format){ return af_format_sample_alignment(format) > 1;}
bool af_fmt_is_pcm(int format){ return af_fmt_is_valid(format) && !af_fmt_is_spdif(format);}
static const int planar_formats[][2] = { {AF_FORMAT_U8P, AF_FORMAT_U8}, {AF_FORMAT_S16P, AF_FORMAT_S16}, {AF_FORMAT_S32P, AF_FORMAT_S32}, {AF_FORMAT_S64P, AF_FORMAT_S64}, {AF_FORMAT_FLOATP, AF_FORMAT_FLOAT}, {AF_FORMAT_DOUBLEP, AF_FORMAT_DOUBLE},};
bool af_fmt_is_planar(int format){ for (int n = 0; n < MP_ARRAY_SIZE(planar_formats); n++) { if (planar_formats[n][0] == format) return true; } return false;}
// Return the planar format corresponding to the given format.// If the format is already planar or if there's no equivalent,// return it.int af_fmt_to_planar(int format){ for (int n = 0; n < MP_ARRAY_SIZE(planar_formats); n++) { if (planar_formats[n][1] == format) return planar_formats[n][0]; } return format;}
// Return the interleaved format corresponding to the given format.// If the format is already interleaved or if there's no equivalent,// return it.int af_fmt_from_planar(int format){ for (int n = 0; n < MP_ARRAY_SIZE(planar_formats); n++) { if (planar_formats[n][0] == format) return planar_formats[n][1]; } return format;}
bool af_fmt_is_valid(int format){ return format > 0 && format < AF_FORMAT_COUNT;}
const char *af_fmt_to_str(int format){ switch (format) { case AF_FORMAT_U8: return "u8"; case AF_FORMAT_S16: return "s16"; case AF_FORMAT_S32: return "s32"; case AF_FORMAT_S64: return "s64"; case AF_FORMAT_FLOAT: return "float"; case AF_FORMAT_DOUBLE: return "double"; case AF_FORMAT_U8P: return "u8p"; case AF_FORMAT_S16P: return "s16p"; case AF_FORMAT_S32P: return "s32p"; case AF_FORMAT_S64P: return "s64p"; case AF_FORMAT_FLOATP: return "floatp"; case AF_FORMAT_DOUBLEP: return "doublep"; case AF_FORMAT_S_AAC: return "spdif-aac"; case AF_FORMAT_S_AC3: return "spdif-ac3"; case AF_FORMAT_S_DTS: return "spdif-dts"; case AF_FORMAT_S_DTSHD: return "spdif-dtshd"; case AF_FORMAT_S_EAC3: return "spdif-eac3"; case AF_FORMAT_S_MP3: return "spdif-mp3"; case AF_FORMAT_S_TRUEHD: return "spdif-truehd"; } return "??";}
void af_fill_silence(void *dst, size_t bytes, int format){ memset(dst, af_fmt_is_unsigned(format) ? 0x80 : 0, bytes);}
// Returns a "score" that serves as heuristic how lossy or hard a conversion is.// If the formats are equal, 1024 is returned. If they are gravely incompatible// (like s16<->ac3), INT_MIN is returned. If there is implied loss of precision// (like s16->s8), a value <0 is returned.int af_format_conversion_score(int dst_format, int src_format){ if (dst_format == AF_FORMAT_UNKNOWN || src_format == AF_FORMAT_UNKNOWN) return INT_MIN; if (dst_format == src_format) return 1024; // Can't be normally converted if (!af_fmt_is_pcm(dst_format) || !af_fmt_is_pcm(src_format)) return INT_MIN; int score = 1024; if (af_fmt_is_planar(dst_format) != af_fmt_is_planar(src_format)) score -= 1; // has to (de-)planarize if (af_fmt_is_float(dst_format) != af_fmt_is_float(src_format)) { int dst_bytes = af_fmt_to_bytes(dst_format); if (af_fmt_is_float(dst_format)) { // For int->float, consider a lower bound on the precision difference. int bytes = (dst_bytes == 4 ? 3 : 6) - af_fmt_to_bytes(src_format); if (bytes >= 0) { score -= 8 * bytes; // excess precision } else { score += 1024 * (bytes - 1); // precision is lost (i.e. s32 -> float) } } else { // float->int is the worst case. Penalize heavily and // prefer highest bit depth int. score -= 1048576 * (8 - dst_bytes); } score -= 512; // penalty for any float <-> int conversion } else { int bytes = af_fmt_to_bytes(dst_format) - af_fmt_to_bytes(src_format); if (bytes > 0) { score -= 8 * bytes; // has to add padding } else if (bytes < 0) { score += 1024 * (bytes - 1); // has to reduce bit depth } } return score;}
struct entry { int fmt; int score;};
static int cmp_entry(const void *a, const void *b){#define CMP_INT(a, b) (a > b ? 1 : (a < b ? -1 : 0)) return -CMP_INT(((struct entry *)a)->score, ((struct entry *)b)->score);}
// Return a list of sample format compatible to src_format, sorted by order// of preference. out_formats[0] will be src_format (as long as it's valid),// and the list is terminated with 0 (AF_FORMAT_UNKNOWN).// Keep in mind that this also returns formats with flipped interleaving// (e.g. for s16, it returns [s16, s16p, ...]).// out_formats must be an int[AF_FORMAT_COUNT + 1] array.void af_get_best_sample_formats(int src_format, int *out_formats){ int num = 0; struct entry e[AF_FORMAT_COUNT + 1]; for (int fmt = 1; fmt < AF_FORMAT_COUNT; fmt++) { int score = af_format_conversion_score(fmt, src_format); if (score > INT_MIN) e[num++] = (struct entry){fmt, score}; } qsort(e, num, sizeof(e[0]), cmp_entry); for (int n = 0; n < num; n++) out_formats[n] = e[n].fmt; out_formats[num] = 0;}
// Return the best match to src_samplerate from the list provided in the array// *available, which must be terminated by 0, or itself NULL. If *available is// empty or NULL, return a negative value. Exact match to src_samplerate is// most preferred, followed by the lowest integer multiple, followed by the// maximum of *available.int af_select_best_samplerate(int src_samplerate, const int *available){ if (!available) return -1;
int min_mult_rate = INT_MAX; int max_rate = INT_MIN; for (int i = 0; available[i]; i++) { if (available[i] == src_samplerate) return available[i];
if (!(available[i] % src_samplerate)) min_mult_rate = MPMIN(min_mult_rate, available[i]);
max_rate = MPMAX(max_rate, available[i]); }
if (min_mult_rate < INT_MAX) return min_mult_rate;
if (max_rate > INT_MIN) return max_rate;
return -1;}
// Return the number of samples that make up one frame in this format.// You get the byte size by multiplying them with sample size and channel count.int af_format_sample_alignment(int format){ switch (format) { case AF_FORMAT_S_AAC: return 16384 / 4; case AF_FORMAT_S_AC3: return 6144 / 4; case AF_FORMAT_S_DTSHD: return 32768 / 16; case AF_FORMAT_S_DTS: return 2048 / 4; case AF_FORMAT_S_EAC3: return 24576 / 4; case AF_FORMAT_S_MP3: return 4608 / 4; case AF_FORMAT_S_TRUEHD: return 61440 / 16; default: return 1; }}