add --gapless-mode

diff --git a/src/m4af.c b/src/m4af.c
index bbb1e2980b567e091119a43d680040eb19364dc5..7a53df87ad6dcbd4ee78fa5f7cfe860d4f3c1501 100644 (file)
--- a/src/m4af.c
+++ b/src/m4af.c
@@ -79,6 +79,7 @@ struct m4af_ctx_t {
     int64_t modification_time;
     int64_t mdat_pos;
     int64_t mdat_size;
+    int priming_mode;
     int last_error;
 
     m4af_itmf_entry_t *itmf_table;
@@ -148,6 +149,13 @@ int m4af_write(m4af_ctx_t *ctx, const void *data, uint32_t size)
     return rc;
 }
 
+static
+int m4af_write16(m4af_ctx_t *ctx, uint32_t data)
+{
+    data = m4af_htob16(data);
+    return m4af_write(ctx, &data, 2);
+}
+
 static
 int m4af_write32(m4af_ctx_t *ctx, uint32_t data)
 {
@@ -277,6 +285,11 @@ void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx,
     track->padding = padding;
 }
 
+void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode)
+{
+    ctx->priming_mode = mode;
+}
+
 static
 int m4af_add_sample_entry(m4af_ctx_t *ctx, uint32_t track_idx,
                           uint32_t size, uint32_t delta)
@@ -823,12 +836,50 @@ void m4af_write_stsd_box(m4af_ctx_t *ctx, uint32_t track_idx)
     m4af_update_box_size(ctx, pos);
 }
 
+static
+void m4af_write_sbgp_box(m4af_ctx_t *ctx, uint32_t track_idx)
+{
+    m4af_track_t *track = &ctx->track[track_idx];
+    m4af_write(ctx,
+               "\0\0\0\034"  /* size: 28                */
+               "sbgp"        /* type                    */
+               "\0"          /* version                 */
+               "\0\0\0"      /* flags                   */
+               "roll"        /* grouping_type           */
+               "\0\0\0\001"  /* entry_count: 1          */
+               , 20);
+    m4af_write32(ctx, track->num_samples);
+    m4af_write32(ctx, 1);    /* group_description_index */
+}
+
+static
+void m4af_write_sgpd_box(m4af_ctx_t *ctx, uint32_t track_idx)
+{
+    m4af_track_t *track = &ctx->track[track_idx];
+    m4af_write(ctx,
+               "\0\0\0\032"  /* size               */
+               "sgpd"        /* type               */
+               "\001"        /* version            */
+               "\0\0\0"      /* flags              */
+               "roll"        /* grouping_type      */
+               "\0\0\0\002"  /* default_length: 2  */
+               "\0\0\0\001"  /* entry_count: 1     */
+               "\377\377"    /* payload_data: -1   */
+               , 26);
+}
+
 static
 void m4af_write_stbl_box(m4af_ctx_t *ctx, uint32_t track_idx)
 {
+    m4af_track_t *track = &ctx->track[track_idx];
     int64_t pos = m4af_tell(ctx);
     m4af_write(ctx, "\0\0\0\0stbl", 8);
     m4af_write_stsd_box(ctx, track_idx);
+    if ((ctx->priming_mode & M4AF_PRIMING_MODE_EDTS) &&
+        (track->encoder_delay || track->padding)) {
+        m4af_write_sbgp_box(ctx, track_idx);
+        m4af_write_sgpd_box(ctx, track_idx);
+    }
     m4af_write_stts_box(ctx, track_idx);
     m4af_write_stsc_box(ctx, track_idx);
     m4af_write_stsz_box(ctx, track_idx);
@@ -962,6 +1013,42 @@ void m4af_write_mdia_box(m4af_ctx_t *ctx, uint32_t track_idx)
     m4af_update_box_size(ctx, pos);
 }
 
+static
+void m4af_write_elst_box(m4af_ctx_t *ctx, uint32_t track_idx)
+{
+    m4af_track_t *track = &ctx->track[track_idx];
+    uint8_t version;
+    int64_t duration = track->duration - track->encoder_delay - track->padding;
+    int64_t pos = m4af_tell(ctx);
+    duration = (double)duration / track->timescale * ctx->timescale + .5;
+    version  = (duration > UINT32_MAX);
+
+    m4af_write(ctx, "\0\0\0\0elst", 8);
+    m4af_write(ctx, &version, 1);
+    m4af_write(ctx, "\0\0\0", 3);  /* flags          */
+    m4af_write32(ctx, 1);          /* entry_count: 1 */
+    if (version) {
+        m4af_write64(ctx, duration);
+        m4af_write64(ctx, track->encoder_delay);
+    } else {
+        m4af_write32(ctx, duration);
+        m4af_write32(ctx, track->encoder_delay);
+    }
+    m4af_write16(ctx, 1);    /* media_rate_integer  */
+    m4af_write16(ctx, 0);    /* media_rate_fraction */
+    m4af_update_box_size(ctx, pos);
+}
+
+static
+void m4af_write_edts_box(m4af_ctx_t *ctx, uint32_t track_idx)
+{
+    m4af_track_t *track = &ctx->track[track_idx];
+    int64_t pos = m4af_tell(ctx);
+    m4af_write(ctx, "\0\0\0\0edts", 8);
+    m4af_write_elst_box(ctx, track_idx);
+    m4af_update_box_size(ctx, pos);
+}
+
 static
 void m4af_write_tkhd_box(m4af_ctx_t *ctx, uint32_t track_idx)
 {
@@ -1015,9 +1102,13 @@ void m4af_write_tkhd_box(m4af_ctx_t *ctx, uint32_t track_idx)
 static
 void m4af_write_trak_box(m4af_ctx_t *ctx, uint32_t track_idx)
 {
+    m4af_track_t *track = &ctx->track[track_idx];
     int64_t pos = m4af_tell(ctx);
     m4af_write(ctx, "\0\0\0\0trak", 8);
     m4af_write_tkhd_box(ctx, track_idx);
+    if ((ctx->priming_mode & M4AF_PRIMING_MODE_EDTS) &&
+        (track->encoder_delay || track->padding))
+        m4af_write_edts_box(ctx, track_idx);
     m4af_write_mdia_box(ctx, track_idx);
     m4af_update_box_size(ctx, pos);
 }
@@ -1227,7 +1318,9 @@ int m4af_finalize(m4af_ctx_t *ctx)
         }
         m4af_flush_chunk(ctx, i);
     }
-    if (ctx->track[0].encoder_delay || ctx->track[0].padding)
+    track = ctx->track;
+    if ((ctx->priming_mode & M4AF_PRIMING_MODE_ITUNSMPB) &&
+        (track->encoder_delay || track->padding))
         m4af_set_iTunSMPB(ctx);
     m4af_finalize_mdat(ctx);
     m4af_write_moov_box(ctx);

diff --git a/src/m4af.h b/src/m4af.h
index 91f4cf8955c3603258e40ab4618b691f8cbb30f2..6c3ba4df6da5179315eed69160a883285ccc7793 100644 (file)
--- a/src/m4af.h
+++ b/src/m4af.h
@@ -52,6 +52,12 @@ enum m4af_codec_type {
     M4AF_CODEC_TEXT = M4AF_FOURCC('t','e','x','t'),
 };
 
+enum m4af_priming_mode {
+    M4AF_PRIMING_MODE_ITUNSMPB = 1,
+    M4AF_PRIMING_MODE_EDTS = 2,
+    M4AF_PRIMING_MODE_BOTH = 3
+};
+
 typedef int (*m4af_read_callback)(void *cookie, void *buffer, uint32_t size);
 typedef int (*m4af_write_callback)(void *cookie, const void *data,
                                    uint32_t size);
@@ -94,6 +100,8 @@ int m4af_set_decoder_specific_info(m4af_ctx_t *ctx, uint32_t track_idx,
 void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx,
                       uint32_t encoder_delay, uint32_t padding);
 
+void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode);
+
 void m4af_set_fixed_frame_duration(m4af_ctx_t *ctx, uint32_t track_idx,
                                    uint32_t length);
 

diff --git a/src/main.c b/src/main.c
index 84690a175d6d8ab74fdd0021650f597541fe2f84..b6eaacbdeb41537bce0ff2533763e7af262a568a 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -148,6 +148,10 @@ PROGNAME " %s\n"
 "                               transport layer\n"
 "\n"
 " -o <filename>                 Output filename\n"
+" -G, --gapless-mode <n>        Encoder delay signaling for gapless playback\n"
+"                                 0: iTunSMPB (default)\n"
+"                                 1: ISO standard (edts + sgpd)\n"
+"                                 2: Both\n"
 " --ignorelength                Ignore length of WAV header\n"
 " -S, --silent                  Don't print progress messages\n"
 "\n"
@@ -199,6 +203,7 @@ typedef struct aacenc_param_ex_t {
 
     char *input_filename;
     char *output_filename;
+    unsigned gapless_mode;
     unsigned ignore_length;
     int silent;
 
@@ -239,6 +244,7 @@ int parse_options(int argc, char **argv, aacenc_param_ex_t *params)
         { "adts-crc-check",   no_argument,       0, 'C' },
         { "header-period",    required_argument, 0, 'P' },
 
+        { "gapless-mode",     required_argument, 0, 'G' },
         { "ignorelength",     no_argument,       0, 'I' },
         { "silent",           no_argument,       0, 'S' },
 
@@ -268,7 +274,7 @@ int parse_options(int argc, char **argv, aacenc_param_ex_t *params)
     params->afterburner = 1;
 
     aacenc_getmainargs(&argc, &argv);
-    while ((ch = getopt_long(argc, argv, "hp:b:m:w:a:Ls:f:CP:Io:SR",
+    while ((ch = getopt_long(argc, argv, "hp:b:m:w:a:Ls:f:CP:G:Io:SR",
                              long_options, 0)) != EOF) {
         switch (ch) {
         case 'h':
@@ -338,6 +344,13 @@ int parse_options(int argc, char **argv, aacenc_param_ex_t *params)
         case 'o':
             params->output_filename = optarg;
             break;
+        case 'G':
+            if (sscanf(optarg, "%u", &n) != 1 || n > 2) {
+                fprintf(stderr, "invalid arg for gapless-mode\n");
+                return -1;
+            }
+            params->gapless_mode = n;
+            break;
         case 'I':
             params->ignore_length = 1;
             break;
@@ -718,6 +731,7 @@ int main(int argc, char **argv)
                                        aacinfo.confSize);
         m4af_set_fixed_frame_duration(m4af, 0,
                                       framelen >> downsampled_timescale);
+        m4af_set_priming_mode(m4af, params.gapless_mode + 1);
         m4af_begin_write(m4af);
     }
     frame_count = encode(wavf, encoder, aacinfo.frameLength, ofp, m4af,